diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthPermissionLedger.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthPermissionLedger.kt
index aa45baf7fa..81caf47040 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthPermissionLedger.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthPermissionLedger.kt
@@ -149,8 +149,24 @@ class RelayAuthPermissionLedger(
     /**
      * Remembers a "log in" answer for [relayUrl] until the app is restarted, so the relay's next
      * reconnect doesn't ask again. Nothing is written to disk — see [RelayAuthSessionGrants].
+     *
+     * Refused, returning false, while [globalPolicy] is [RelayAuthPolicy.NEVER]: that is the
+     * switch-it-all-off answer, and a session grant outranks the policy (see [RelayAuthResolver]),
+     * so recording one here would quietly re-enable the very thing the user just turned off. The
+     * settings screen clears existing grants when the policy is set to NEVER; this stops a *new*
+     * one being written afterwards — which the undo on "forget this login" otherwise did, because
+     * its snackbar carries an action label and so sits on screen indefinitely, long enough for the
+     * policy to change underneath it.
+     *
+     * Only the policy needs this guard. A stored override arriving in the same window is
+     * self-protecting: it is ranked *above* the grant, so an ALLOW or DENY written meanwhile
+     * decides the relay either way. So is the block list, which outranks everything.
      */
-    fun grantForSession(relayUrl: String) = sessionGrants.grant(relayUrl)
+    fun grantForSession(relayUrl: String): Boolean {
+        if (globalPolicy() == RelayAuthPolicy.NEVER) return false
+        sessionGrants.grant(relayUrl)
+        return true
+    }
 
     /** Forgets this session's grant for [relayUrl], so the next challenge is decided from scratch. */
     fun revokeSessionGrant(relayUrl: String) = sessionGrants.revoke(relayUrl)
diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relayauth/RelayAuthSettingsScreen.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relayauth/RelayAuthSettingsScreen.kt
index 31b333c2cb..8f676adbcd 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relayauth/RelayAuthSettingsScreen.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relayauth/RelayAuthSettingsScreen.kt
@@ -155,18 +155,29 @@ fun RelayAuthSettingsScreen(
 
     val removedLabel = stringResource(R.string.relay_auth_exception_removed_undo)
     val sessionForgottenLabel = stringResource(R.string.relay_auth_session_forgotten_undo)
+    val sessionUndoBlockedLabel = stringResource(R.string.relay_auth_session_undo_blocked)
     val undoLabel = stringResource(R.string.relay_auth_undo)
 
     fun forgetSessionGrant(url: String) {
         ledger.revokeSessionGrant(url)
         scope.launch {
+            val display = url.normalizeRelayUrlOrNull()?.displayUrl() ?: url
             val result =
                 snackbarHostState.showSnackbar(
-                    message = sessionForgottenLabel.format(url.normalizeRelayUrlOrNull()?.displayUrl() ?: url),
+                    message = sessionForgottenLabel.format(display),
                     actionLabel = undoLabel,
                     withDismissAction = true,
                 )
-            if (result == SnackbarResult.ActionPerformed) ledger.grantForSession(url)
+            // An action label makes Material3 show this indefinitely, so the undo can be tapped long
+            // after the fact — including after the policy above was switched to "Never log in", which
+            // clears every grant. The ledger refuses to write a new one in that state; report that
+            // instead of leaving a tapped undo looking like it silently did nothing.
+            if (result == SnackbarResult.ActionPerformed && !ledger.grantForSession(url)) {
+                snackbarHostState.showSnackbar(
+                    message = sessionUndoBlockedLabel.format(display),
+                    withDismissAction = true,
+                )
+            }
         }
     }
 
diff --git a/amethyst/src/main/res/values/strings.xml b/amethyst/src/main/res/values/strings.xml
index a8e4100d84..89bd5d8792 100644
--- a/amethyst/src/main/res/values/strings.xml
+++ b/amethyst/src/main/res/values/strings.xml
@@ -1202,6 +1202,7 @@
     <string name="relay_auth_session_row_desc">Logged in until you restart Amethyst</string>
     <string name="relay_auth_forget_session">Forget this login</string>
     <string name="relay_auth_session_forgotten_undo">%1$s will ask again the next time it needs you.</string>
+    <string name="relay_auth_session_undo_blocked">Not restored. “Never log in” is on, so Amethyst won\'t log in to %1$s.</string>
     <string name="relay_auth_blocked_section">Blocked by your block list</string>
     <string name="relay_auth_blocked_row_desc">Amethyst never logs in to blocked relays.</string>
     <string name="relay_auth_no_blocked">Nothing blocked. Relays you block will never be logged in to, whatever you set here.</string>
diff --git a/amethyst/src/test/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthSessionGrantsTest.kt b/amethyst/src/test/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthSessionGrantsTest.kt
index b9285192c8..c3290c9876 100644
--- a/amethyst/src/test/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthSessionGrantsTest.kt
+++ b/amethyst/src/test/java/com/vitorpamplona/amethyst/service/relayClient/authCommand/model/RelayAuthSessionGrantsTest.kt
@@ -53,9 +53,10 @@ class RelayAuthSessionGrantsTest {
         grants: RelayAuthSessionGrants = RelayAuthSessionGrants(),
         store: RelayAuthPermissionStore = InMemoryRelayAuthPermissionStore(),
         blocked: Set<String> = emptySet(),
+        policy: () -> RelayAuthPolicy = { RelayAuthPolicy.CUSTOM },
     ) = RelayAuthPermissionLedger(
         store = store,
-        globalPolicy = { RelayAuthPolicy.CUSTOM },
+        globalPolicy = policy,
         sessionGrants = grants,
         isBlocked = { it in blocked },
     )
@@ -234,4 +235,58 @@ class RelayAuthSessionGrantsTest {
         grants.clear()
         assertEquals(emptySet<String>(), grants.grants.value)
     }
+
+    @Test
+    fun aGrantIsRefusedWhileThePolicyIsNever() =
+        runTest {
+            val grants = RelayAuthSessionGrants()
+            val ledger = ledger(grants = grants, policy = { RelayAuthPolicy.NEVER })
+
+            assertFalse(ledger.grantForSession(relay))
+            assertFalse(grants.isGranted(relay))
+            assertEquals(RelayAuthVerdict.DENY, ledger.decide(askable(relay)))
+        }
+
+    @Test
+    fun undoingAForgetAfterSwitchingToNeverDoesNotResurrectTheGrant() =
+        runTest {
+            // The settings screen's undo snackbar carries an action label, so Material3 leaves it up
+            // indefinitely — the user can switch the whole policy off and only then tap undo.
+            val grants = RelayAuthSessionGrants()
+            var policy = RelayAuthPolicy.CUSTOM
+            val ledger = ledger(grants = grants, policy = { policy })
+
+            assertTrue(ledger.grantForSession(relay))
+            assertEquals(RelayAuthVerdict.ALLOW, ledger.decide(askable(relay)))
+
+            // "Forget this login", then "Never log in" — which also clears what is already granted.
+            ledger.revokeSessionGrant(relay)
+            policy = RelayAuthPolicy.NEVER
+            grants.clear()
+
+            // ...and only now, undo.
+            assertFalse(ledger.grantForSession(relay))
+            assertEquals(RelayAuthVerdict.DENY, ledger.decide(askable(relay)))
+        }
+
+    @Test
+    fun theGuardOnlyAppliesToNever() =
+        runTest {
+            assertTrue(ledger(policy = { RelayAuthPolicy.CUSTOM }).grantForSession(relay))
+            assertTrue(ledger(policy = { RelayAuthPolicy.ALWAYS }).grantForSession(relay))
+        }
+
+    @Test
+    fun aStoredDecisionTakenDuringTheUndoWindowNeedsNoGuardBecauseItOutranksTheGrant() =
+        runTest {
+            // Why the guard is narrowed to the policy: an override written while the snackbar was up
+            // is ranked above the grant, so restoring the grant cannot undo the user's newer answer.
+            val ledger = ledger()
+
+            ledger.revokeSessionGrant(relay)
+            ledger.setDecision(relay, RelayAuthDecision.DENY)
+
+            assertTrue(ledger.grantForSession(relay))
+            assertEquals(RelayAuthVerdict.DENY, ledger.decide(askable(relay)))
+        }
 }