diff --git a/src/lib/email-processor.test.ts b/src/lib/email-processor.test.ts
index 3ada63b..e1d2ed2 100644
--- a/src/lib/email-processor.test.ts
+++ b/src/lib/email-processor.test.ts
@@ -86,6 +86,69 @@ describe("processEmail", () => {
     expect(res.status).toBe(200);
   });
 
+  it("returns 403 when sender is in blocklist by exact address", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({ blocked_senders: ["sender@example.com"] }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(403);
+  });
+
+  it("returns 403 when sender is in blocklist by domain", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({ blocked_senders: ["example.com"] }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(403);
+  });
+
+  it("returns 200 when sender is not in blocklist", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({ blocked_senders: ["other@example.com"] }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(200);
+  });
+
+  it("exact block takes precedence over domain allow", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({
+        allowed_senders: ["example.com"],
+        blocked_senders: ["sender@example.com"],
+      }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(403);
+  });
+
+  it("exact allow overrides domain block (exception use case)", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({
+        allowed_senders: ["sender@example.com"],
+        blocked_senders: ["example.com"],
+      }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(200);
+  });
+
+  it("exact block takes precedence over exact allow", async () => {
+    await env.EMAIL_STORAGE.put(
+      `feed:${VALID_FEED_ID}:config`,
+      JSON.stringify({
+        allowed_senders: ["sender@example.com"],
+        blocked_senders: ["sender@example.com"],
+      }),
+    );
+    const res = await processEmail(makeInput(), env as any);
+    expect(res.status).toBe(403);
+  });
+
   it("stores email data and updates metadata in KV", async () => {
     await env.EMAIL_STORAGE.put(
       `feed:${VALID_FEED_ID}:config`,
diff --git a/src/lib/email-processor.ts b/src/lib/email-processor.ts
index 5eeb129..43a28d9 100644
--- a/src/lib/email-processor.ts
+++ b/src/lib/email-processor.ts
@@ -35,23 +35,32 @@ function normalizeEmail(value: string): string {
   return value.trim().toLowerCase();
 }
 
-function senderMatchesAllowlist(
+type SenderDecision = "blocked" | "allowed" | "neutral";
+
+function evaluateSender(
   sender: string,
-  allowedSender: string,
-): boolean {
-  if (!allowedSender) return false;
+  allowedSenders: string[],
+  blockedSenders: string[],
+): SenderDecision {
+  const normalized = normalizeEmail(sender);
+  const domain = normalized.split("@")[1] || "";
 
-  const normalizedSender = normalizeEmail(sender);
+  const normalizeDomain = (e: string) => (e.startsWith("@") ? e.slice(1) : e);
 
-  if (allowedSender.includes("@")) {
-    return normalizedSender === allowedSender;
-  }
+  const exactBlocked = blockedSenders.filter((e) => e.includes("@"));
+  const exactAllowed = allowedSenders.filter((e) => e.includes("@"));
+  const domainBlocked = blockedSenders
+    .filter((e) => !e.includes("@"))
+    .map(normalizeDomain);
+  const domainAllowed = allowedSenders
+    .filter((e) => !e.includes("@"))
+    .map(normalizeDomain);
 
-  const senderDomain = normalizedSender.split("@")[1] || "";
-  const normalizedDomain = allowedSender.startsWith("@")
-    ? allowedSender.slice(1)
-    : allowedSender;
-  return senderDomain === normalizedDomain;
+  if (exactBlocked.includes(normalized)) return "blocked";
+  if (exactAllowed.includes(normalized)) return "allowed";
+  if (domain && domainBlocked.includes(domain)) return "blocked";
+  if (domain && domainAllowed.includes(domain)) return "allowed";
+  return "neutral";
 }
 
 async function uploadAttachments(
@@ -107,17 +116,25 @@ export async function validateEmail(
   const allowedSenders = (feedConfig.allowed_senders || [])
     .map(normalizeEmail)
     .filter(Boolean);
-  if (allowedSenders.length > 0) {
-    const senderAllowed = input.senders.some((sender) =>
-      allowedSenders.some((allowedSender) =>
-        senderMatchesAllowlist(sender, allowedSender),
-      ),
-    );
-    if (!senderAllowed) {
-      logger.warn("Rejected email: sender not in allowlist", {
+  const blockedSenders = (feedConfig.blocked_senders || [])
+    .map(normalizeEmail)
+    .filter(Boolean);
+
+  if (allowedSenders.length > 0 || blockedSenders.length > 0) {
+    const hasAllowlist = allowedSenders.length > 0;
+    const accepted = input.senders.some((sender) => {
+      const decision = evaluateSender(sender, allowedSenders, blockedSenders);
+      if (decision === "allowed") return true;
+      if (decision === "blocked") return false;
+      return !hasAllowlist;
+    });
+
+    if (!accepted) {
+      logger.warn("Rejected email: sender filter", {
         feedId,
         senders: input.senders,
         allowedSenders,
+        blockedSenders,
       });
       return {
         ok: false,
diff --git a/src/routes/admin.test.ts b/src/routes/admin.test.ts
index d7a849b..aef75dd 100644
--- a/src/routes/admin.test.ts
+++ b/src/routes/admin.test.ts
@@ -563,4 +563,129 @@ describe("Admin Routes", () => {
       });
     });
   });
+
+  describe("Sender filter", () => {
+    let authCookie: string;
+    let feedId: string;
+
+    beforeEach(async () => {
+      authCookie = await loginAndGetCookie();
+      const createRes = await request("/admin/feeds/create", {
+        method: "POST",
+        headers: {
+          Cookie: authCookie,
+          "Content-Type": "application/json",
+          Origin: "https://test.getmynews.app",
+        },
+        body: JSON.stringify({ title: "Filter Test Feed" }),
+      });
+      const payload = (await createRes.json()) as { feedId: string };
+      feedId = payload.feedId;
+    });
+
+    const post = (body: object, cookie = authCookie) =>
+      request(`/admin/feeds/${feedId}/sender-filter`, {
+        method: "POST",
+        headers: {
+          Cookie: cookie,
+          "Content-Type": "application/json",
+          Origin: "https://test.getmynews.app",
+        },
+        body: JSON.stringify(body),
+      });
+
+    it("adds exact email to allowlist", async () => {
+      const res = await post({
+        action: "allow_sender",
+        value: "alice@example.com",
+      });
+      expect(res.status).toBe(200);
+      expect(((await res.json()) as any).ok).toBe(true);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(cfg.allowed_senders).toContain("alice@example.com");
+    });
+
+    it("adds domain to allowlist", async () => {
+      const res = await post({ action: "allow_domain", value: "example.com" });
+      expect(res.status).toBe(200);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(cfg.allowed_senders).toContain("example.com");
+    });
+
+    it("adds exact email to blocklist", async () => {
+      const res = await post({ action: "block_sender", value: "spam@bad.com" });
+      expect(res.status).toBe(200);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(cfg.blocked_senders).toContain("spam@bad.com");
+    });
+
+    it("adds domain to blocklist", async () => {
+      const res = await post({ action: "block_domain", value: "bad.com" });
+      expect(res.status).toBe(200);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(cfg.blocked_senders).toContain("bad.com");
+    });
+
+    it("returns 409 when value already exists in the opposite list", async () => {
+      await post({ action: "block_sender", value: "alice@example.com" });
+      const res = await post({
+        action: "allow_sender",
+        value: "alice@example.com",
+      });
+      expect(res.status).toBe(409);
+      const data = (await res.json()) as any;
+      expect(data.ok).toBe(false);
+      expect(data.error).toMatch(/blocklist/);
+    });
+
+    it("is idempotent when value already in target list", async () => {
+      await post({ action: "allow_sender", value: "alice@example.com" });
+      const res = await post({
+        action: "allow_sender",
+        value: "alice@example.com",
+      });
+      expect(res.status).toBe(200);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(
+        cfg.allowed_senders.filter((s: string) => s === "alice@example.com")
+          .length,
+      ).toBe(1);
+    });
+
+    it("returns 400 for invalid action", async () => {
+      const res = await post({
+        action: "invalid_action",
+        value: "alice@example.com",
+      });
+      expect(res.status).toBe(400);
+    });
+
+    it("normalizes value to lowercase", async () => {
+      const res = await post({
+        action: "allow_sender",
+        value: "Alice@Example.COM",
+      });
+      expect(res.status).toBe(200);
+      const cfg = (await mockEnv.EMAIL_STORAGE.get(
+        `feed:${feedId}:config`,
+        "json",
+      )) as any;
+      expect(cfg.allowed_senders).toContain("alice@example.com");
+    });
+  });
 });
diff --git a/src/routes/admin.tsx b/src/routes/admin.tsx
index c751011..cb55f9a 100644
--- a/src/routes/admin.tsx
+++ b/src/routes/admin.tsx
@@ -380,6 +380,22 @@ app.get("/", async (c) => {
               </small>
             </div>
 
+            <div class="form-group">
+              <label for="blocked_senders">
+                Blocked senders (optional, one email or domain per line)
+              </label>
+              <textarea
+                id="blocked_senders"
+                name="blocked_senders"
+                rows={3}
+                placeholder={"spam@example.com\nunwanted.com"}
+              ></textarea>
+              <small>
+                Emails from these senders/domains are always rejected, even if
+                they match the allowlist.
+              </small>
+            </div>
+
             <input type="hidden" id="language" name="language" value="en" />
             <input type="hidden" name="view" value={view} />
 
diff --git a/src/routes/admin/emails.tsx b/src/routes/admin/emails.tsx
index b8639ba..c4e18f8 100644
--- a/src/routes/admin/emails.tsx
+++ b/src/routes/admin/emails.tsx
@@ -72,6 +72,82 @@ const CopyField = ({ label, value, display }: CopyFieldProps) => (
   </div>
 );
 
+function extractSenderEmail(from: string): string {
+  const match = from.match(/<([^>]+@[^>]+)>/);
+  return match ? match[1].trim().toLowerCase() : from.trim().toLowerCase();
+}
+
+type SenderFieldProps = {
+  from: string;
+  feedId: string;
+};
+
+const SenderField = ({ from, feedId }: SenderFieldProps) => {
+  const senderEmail = extractSenderEmail(from);
+  const senderDomain = senderEmail.split("@")[1] || "";
+
+  return (
+    <div class="copyable">
+      <span class="copyable-label">From:</span>
+      <div class="copyable-content">
+        <span class="copyable-value" data-copy={from}>
+          {from}
+        </span>
+        <div class="copy-icon-container">
+          <CopyIcon />
+          <CheckIcon />
+        </div>
+      </div>
+      <div
+        class="sender-filter-dropdown"
+        data-feed-id={feedId}
+        data-email={senderEmail}
+        data-domain={senderDomain}
+      >
+        <button
+          type="button"
+          class="sender-filter-btn"
+          aria-label="Sender filter options"
+          onclick="toggleSenderFilter(this)"
+        >
+          ⋮
+        </button>
+        <div class="sender-filter-menu" role="menu">
+          <button
+            type="button"
+            class="sender-filter-item sender-filter-allow"
+            data-action="allow_sender"
+          >
+            Allow {senderEmail}
+          </button>
+          <button
+            type="button"
+            class="sender-filter-item sender-filter-allow"
+            data-action="allow_domain"
+          >
+            Allow @{senderDomain}
+          </button>
+          <button
+            type="button"
+            class="sender-filter-item sender-filter-block"
+            data-action="block_sender"
+          >
+            Block {senderEmail}
+          </button>
+          <button
+            type="button"
+            class="sender-filter-item sender-filter-block"
+            data-action="block_domain"
+          >
+            Block @{senderDomain}
+          </button>
+        </div>
+        <span class="sender-filter-feedback" aria-live="polite"></span>
+      </div>
+    </div>
+  );
+};
+
 // ── View all emails for a feed ────────────────────────────────────────────────
 
 emailsRouter.get("/feeds/:feedId/emails", async (c) => {
@@ -397,6 +473,51 @@ emailsRouter.get("/emails/:emailKey", async (c) => {
             };
           } catch (e) { /* cross-origin */ }
         });
+        function toggleSenderFilter(btn) {
+          var dropdown = btn.closest('.sender-filter-dropdown');
+          var isOpen = dropdown.hasAttribute('data-open');
+          document.querySelectorAll('.sender-filter-dropdown[data-open]').forEach(function(d) {
+            d.removeAttribute('data-open');
+          });
+          if (!isOpen) dropdown.setAttribute('data-open', '');
+        }
+        function showSenderFeedback(feedback, ok, msg) {
+          feedback.textContent = msg;
+          feedback.className = 'sender-filter-feedback ' + (ok ? 'sender-filter-feedback-ok' : 'sender-filter-feedback-error');
+          setTimeout(function() {
+            feedback.textContent = '';
+            feedback.className = 'sender-filter-feedback';
+          }, 3000);
+        }
+        document.addEventListener('click', function(e) {
+          var item = e.target.closest('.sender-filter-item');
+          if (item) {
+            var dropdown = item.closest('.sender-filter-dropdown');
+            var action = item.dataset.action;
+            var value = (action === 'allow_sender' || action === 'block_sender')
+              ? dropdown.dataset.email
+              : dropdown.dataset.domain;
+            dropdown.removeAttribute('data-open');
+            var feedback = dropdown.querySelector('.sender-filter-feedback');
+            fetch('/admin/feeds/' + dropdown.dataset.feedId + '/sender-filter', {
+              method: 'POST',
+              headers: { 'Content-Type': 'application/json' },
+              body: JSON.stringify({ action: action, value: value })
+            }).then(function(res) {
+              return res.json();
+            }).then(function(data) {
+              showSenderFeedback(feedback, data.ok, data.ok ? 'Saved' : (data.error || 'Error'));
+            }).catch(function() {
+              showSenderFeedback(feedback, false, 'Network error');
+            });
+            return;
+          }
+          if (!e.target.closest('.sender-filter-dropdown')) {
+            document.querySelectorAll('.sender-filter-dropdown[data-open]').forEach(function(d) {
+              d.removeAttribute('data-open');
+            });
+          }
+        });
       `;
 
   return c.html(
@@ -424,7 +545,7 @@ emailsRouter.get("/emails/:emailKey", async (c) => {
                 label="Received:"
                 value={new Date(emailData.receivedAt).toLocaleString()}
               />
-              <CopyField label="From:" value={emailData.from} />
+              <SenderField from={emailData.from} feedId={feedId} />
               <CopyField
                 label="To:"
                 value={feedEmailAddress(feedId, env)}
diff --git a/src/routes/admin/feeds.tsx b/src/routes/admin/feeds.tsx
index 4715510..dcea130 100644
--- a/src/routes/admin/feeds.tsx
+++ b/src/routes/admin/feeds.tsx
@@ -31,6 +31,7 @@ const createFeedSchema = z.object({
   description: z.string().optional(),
   language: z.string().optional().default("en"),
   allowedSenders: z.array(z.string()).optional().default([]),
+  blockedSenders: z.array(z.string()).optional().default([]),
 });
 
 const updateFeedSchema = z.object({
@@ -38,6 +39,12 @@ const updateFeedSchema = z.object({
   description: z.string().optional(),
   language: z.string().optional().default("en"),
   allowedSenders: z.array(z.string()).optional().default([]),
+  blockedSenders: z.array(z.string()).optional().default([]),
+});
+
+const senderFilterSchema = z.object({
+  action: z.enum(["allow_sender", "allow_domain", "block_sender", "block_domain"]),
+  value: z.string().min(1),
 });
 
 // ── Delete helpers ────────────────────────────────────────────────────────────
@@ -156,6 +163,7 @@ feedsRouter.post("/create", async (c) => {
     let language: string;
     let view: string;
     let allowedSenders: string[];
+    let blockedSenders: string[];
 
     if (isJson) {
       const body = await c.req.json<Record<string, unknown>>();
@@ -169,6 +177,11 @@ feedsRouter.post("/create", async (c) => {
             (body.allowedSenders as unknown[]).map(String),
           )
         : [];
+      blockedSenders = Array.isArray(body.blockedSenders)
+        ? normalizeAllowedSenders(
+            (body.blockedSenders as unknown[]).map(String),
+          )
+        : [];
     } else {
       const formData = await c.req.formData();
       title = formData.get("title")?.toString() || "";
@@ -178,6 +191,9 @@ feedsRouter.post("/create", async (c) => {
       allowedSenders = parseAllowedSenders(
         formData.get("allowed_senders")?.toString() || "",
       );
+      blockedSenders = parseAllowedSenders(
+        formData.get("blocked_senders")?.toString() || "",
+      );
     }
 
     const parsedData = createFeedSchema.parse({
@@ -185,6 +201,7 @@ feedsRouter.post("/create", async (c) => {
       description,
       language,
       allowedSenders,
+      blockedSenders,
     });
 
     const feedId = generateFeedId();
@@ -194,6 +211,7 @@ feedsRouter.post("/create", async (c) => {
       description: parsedData.description,
       language: parsedData.language,
       allowed_senders: parsedData.allowedSenders,
+      blocked_senders: parsedData.blockedSenders,
       created_at: Date.now(),
       updated_at: Date.now(),
     };
@@ -295,6 +313,24 @@ feedsRouter.get("/:feedId/edit", async (c) => {
               </small>
             </div>
 
+            <div class="form-group">
+              <label for="blocked_senders">
+                Blocked senders (optional, one email or domain per line)
+              </label>
+              <textarea
+                id="blocked_senders"
+                name="blocked_senders"
+                rows={3}
+                placeholder={"spam@example.com\nunwanted.com"}
+              >
+                {(feedConfig.blocked_senders || []).join("\n")}
+              </textarea>
+              <small>
+                Emails from these senders/domains are always rejected, even if
+                they match the allowlist.
+              </small>
+            </div>
+
             <input type="hidden" id="language" name="language" value="en" />
 
             <button type="submit" class="button">
@@ -320,12 +356,16 @@ feedsRouter.post("/:feedId/edit", async (c) => {
     const allowedSenders = parseAllowedSenders(
       formData.get("allowed_senders")?.toString() || "",
     );
+    const blockedSenders = parseAllowedSenders(
+      formData.get("blocked_senders")?.toString() || "",
+    );
 
     const parsedData = updateFeedSchema.parse({
       title,
       description,
       language,
       allowedSenders,
+      blockedSenders,
     });
 
     const feedConfigKey = `feed:${feedId}:config`;
@@ -345,6 +385,7 @@ feedsRouter.post("/:feedId/edit", async (c) => {
         description: parsedData.description,
         language: parsedData.language,
         allowed_senders: parsedData.allowedSenders,
+        blocked_senders: parsedData.blockedSenders,
         updated_at: Date.now(),
       }),
     );
@@ -363,6 +404,65 @@ feedsRouter.post("/:feedId/edit", async (c) => {
   }
 });
 
+// ── Sender filter quick-add ───────────────────────────────────────────────────
+
+feedsRouter.post("/:feedId/sender-filter", async (c) => {
+  const env = c.env;
+  const feedId = c.req.param("feedId");
+  const feedConfigKey = `feed:${feedId}:config`;
+
+  const body = await c.req.json().catch(() => null);
+  const parsed = senderFilterSchema.safeParse(body);
+  if (!parsed.success) {
+    return c.json({ ok: false, error: "Invalid request" }, 400);
+  }
+
+  const { action, value } = parsed.data;
+  const normalized = value.trim().toLowerCase();
+
+  const feedConfig = (await env.EMAIL_STORAGE.get(feedConfigKey, {
+    type: "json",
+  })) as FeedConfig | null;
+  if (!feedConfig) return c.json({ ok: false, error: "Feed not found" }, 404);
+
+  const allowedSenders = (feedConfig.allowed_senders || []).map((s) =>
+    s.trim().toLowerCase(),
+  );
+  const blockedSenders = (feedConfig.blocked_senders || []).map((s) =>
+    s.trim().toLowerCase(),
+  );
+
+  const isAllowAction = action === "allow_sender" || action === "allow_domain";
+  const targetList = isAllowAction ? allowedSenders : blockedSenders;
+  const oppositeList = isAllowAction ? blockedSenders : allowedSenders;
+  const oppositeLabel = isAllowAction ? "blocklist" : "allowlist";
+
+  if (oppositeList.includes(normalized)) {
+    return c.json(
+      {
+        ok: false,
+        error: `"${normalized}" is already in the ${oppositeLabel}`,
+      },
+      409,
+    );
+  }
+
+  if (!targetList.includes(normalized)) {
+    targetList.push(normalized);
+    await env.EMAIL_STORAGE.put(
+      feedConfigKey,
+      JSON.stringify({
+        ...feedConfig,
+        allowed_senders: allowedSenders,
+        blocked_senders: blockedSenders,
+        updated_at: Date.now(),
+      }),
+    );
+  }
+
+  return c.json({ ok: true });
+});
+
 feedsRouter.post("/:feedId/delete", async (c) => {
   const env = c.env;
   const emailStorage = env.EMAIL_STORAGE;
diff --git a/src/styles/utilities.css b/src/styles/utilities.css
index 20a6b35..98a0f67 100644
--- a/src/styles/utilities.css
+++ b/src/styles/utilities.css
@@ -124,3 +124,106 @@
   opacity: 1;
   transform: translate(-50%, -50%) scale(1);
 }
+
+/* ── Sender filter dropdown ── */
+
+.sender-filter-dropdown {
+  position: relative;
+  flex-shrink: 0;
+  margin-left: var(--spacing-xs);
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+}
+
+.sender-filter-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 28px;
+  height: 28px;
+  padding: 0;
+  background: none;
+  border: none;
+  border-radius: var(--radius-sm);
+  color: var(--color-text-secondary);
+  font-size: 18px;
+  line-height: 1;
+  cursor: pointer;
+  transition:
+    background-color var(--transition-fast),
+    color var(--transition-fast);
+}
+
+.sender-filter-btn:hover {
+  background-color: rgba(255, 255, 255, 0.08);
+  color: var(--color-text-primary);
+}
+
+.sender-filter-menu {
+  display: none;
+  position: absolute;
+  right: 0;
+  top: calc(100% + 4px);
+  min-width: 220px;
+  background-color: var(--color-card);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  box-shadow: var(--shadow-md);
+  z-index: 100;
+  overflow: hidden;
+}
+
+.sender-filter-dropdown[data-open] .sender-filter-menu {
+  display: block;
+}
+
+.sender-filter-item {
+  display: block;
+  width: 100%;
+  padding: var(--spacing-sm) var(--spacing-md);
+  text-align: left;
+  background: none;
+  border: none;
+  font-size: var(--font-size-sm);
+  cursor: pointer;
+  transition: background-color var(--transition-fast);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.sender-filter-allow {
+  color: var(--color-success);
+}
+
+.sender-filter-allow:hover {
+  background-color: rgba(48, 209, 88, 0.12);
+}
+
+.sender-filter-block {
+  color: var(--color-danger);
+}
+
+.sender-filter-block:hover {
+  background-color: rgba(255, 69, 58, 0.12);
+}
+
+/* Divider between allow and block groups */
+.sender-filter-block:first-of-type {
+  border-top: 1px solid var(--color-border);
+}
+
+.sender-filter-feedback {
+  font-size: var(--font-size-xs);
+  white-space: nowrap;
+  min-height: 16px;
+}
+
+.sender-filter-feedback-ok {
+  color: var(--color-success);
+}
+
+.sender-filter-feedback-error {
+  color: var(--color-danger);
+}
diff --git a/src/types/index.ts b/src/types/index.ts
index 3bee2a4..bca5607 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -33,6 +33,7 @@ export interface FeedConfig {
   title: string;
   description?: string;
   allowed_senders?: string[];
+  blocked_senders?: string[];
   language: string;
   author?: string;
   created_at: number;