diff --git a/src/app.sagas.ts b/src/app.sagas.ts
index 2486b479..feb33d07 100644
--- a/src/app.sagas.ts
+++ b/src/app.sagas.ts
@@ -1,6 +1,7 @@
 import { Injectable } from '@nestjs/common';
 import { type ICommand, Saga, ofType } from '@nestjs/cqrs';
 import { Observable, filter, map, mergeMap } from 'rxjs';
+import { BlacklistSearchCommand } from './blacklist/blacklist.commands.js';
 import { RemoveRolesCommand } from './signup/commands/signup.commands.js';
 import {
   SignupApprovedEvent,
@@ -23,9 +24,10 @@ class AppSagas {
   handleSignupCreated = (event$: Observable<any>): Observable<ICommand> =>
     event$.pipe(
       ofType(SignupCreatedEvent),
-      map(
-        ({ signup, guildId }) => new SendSignupReviewCommand(signup, guildId),
-      ),
+      mergeMap(({ signup, guildId }) => [
+        new SendSignupReviewCommand(signup, guildId),
+        new BlacklistSearchCommand(signup, guildId),
+      ]),
     );
 
   /**
diff --git a/src/blacklist/blacklist.commands.ts b/src/blacklist/blacklist.commands.ts
index 0009e06a..611b6ea9 100644
--- a/src/blacklist/blacklist.commands.ts
+++ b/src/blacklist/blacklist.commands.ts
@@ -1,4 +1,5 @@
 import type { ChatInputCommandInteraction } from 'discord.js';
+import type { SignupDocument } from '../firebase/models/signup.model.js';
 import type { DiscordCommand } from '../slash-commands/slash-commands.interfaces.js';
 
 export class BlacklistAddCommand implements DiscordCommand {
@@ -18,3 +19,10 @@ export class BlacklistDisplayCommand implements DiscordCommand {
     public readonly interaction: ChatInputCommandInteraction<'raw' | 'cached'>,
   ) {}
 }
+
+export class BlacklistSearchCommand {
+  constructor(
+    public readonly signup: SignupDocument,
+    public readonly guildId: string,
+  ) {}
+}
diff --git a/src/blacklist/blacklist.module.ts b/src/blacklist/blacklist.module.ts
index cbf62dc9..9bb17278 100644
--- a/src/blacklist/blacklist.module.ts
+++ b/src/blacklist/blacklist.module.ts
@@ -2,6 +2,7 @@ import { Module } from '@nestjs/common';
 import { CqrsModule } from '@nestjs/cqrs';
 import { DiscordModule } from '../discord/discord.module.js';
 import { FirebaseModule } from '../firebase/firebase.module.js';
+import { BlacklistSearchCommandHandler } from './commands/handlers/blacklist-search.command-handler.js';
 import { BlacklistUpdatedEventHandler } from './events/handlers/blacklist-updated.event-handler.js';
 import { BlacklistAddCommandHandler } from './subcommands/add/blacklist-add.command-handler.js';
 import { BlacklistDisplayCommandHandler } from './subcommands/display/blacklist-display.command-handler.js';
@@ -17,6 +18,7 @@ import { BlacklistRemoveCommandHandler } from './subcommands/remove/blacklist-re
     BlacklistRemoveCommandHandler,
     BlacklistDisplayCommandHandler,
     BlacklistUpdatedEventHandler,
+    BlacklistSearchCommandHandler,
   ],
 })
 class BlacklistModule {}
diff --git a/src/blacklist/blacklist.utils.ts b/src/blacklist/blacklist.utils.ts
index b9b59198..ec3fe167 100644
--- a/src/blacklist/blacklist.utils.ts
+++ b/src/blacklist/blacklist.utils.ts
@@ -1,4 +1,8 @@
-import type { CacheType, ChatInputCommandInteraction } from 'discord.js';
+import type {
+  APIEmbedField,
+  CacheType,
+  ChatInputCommandInteraction,
+} from 'discord.js';
 import type { BlacklistDocument } from '../firebase/models/blacklist.model.js';
 
 export function getDiscordId(
@@ -24,3 +28,16 @@ export function getDisplayName({
 
   return characterName!;
 }
+
+export function createBlacklistEmbedFields({
+  characterName,
+  discordId,
+  reason,
+}: BlacklistDocument): APIEmbedField[] {
+  const displayName = getDisplayName({ characterName, discordId });
+  return [
+    { name: 'Player', value: displayName, inline: true },
+    { name: 'Reason', value: reason, inline: true },
+    { name: '\u200b', value: '\u200b', inline: true },
+  ];
+}
diff --git a/src/blacklist/commands/handlers/blacklist-search.command-handler.ts b/src/blacklist/commands/handlers/blacklist-search.command-handler.ts
new file mode 100644
index 00000000..87264ff4
--- /dev/null
+++ b/src/blacklist/commands/handlers/blacklist-search.command-handler.ts
@@ -0,0 +1,95 @@
+import { Logger } from '@nestjs/common';
+import { CommandHandler, type ICommandHandler } from '@nestjs/cqrs';
+import { EmbedBuilder } from 'discord.js';
+import { EMPTY, EmptyError, catchError, lastValueFrom, mergeMap } from 'rxjs';
+import { getMessageLink } from '../../../discord/discord.consts.js';
+import { DiscordService } from '../../../discord/discord.service.js';
+import { BlacklistCollection } from '../../../firebase/collections/blacklist-collection.js';
+import { SettingsCollection } from '../../../firebase/collections/settings-collection.js';
+import type { BlacklistDocument } from '../../../firebase/models/blacklist.model.js';
+import type { SignupDocument } from '../../../firebase/models/signup.model.js';
+import { BlacklistSearchCommand } from '../../blacklist.commands.js';
+import { createBlacklistEmbedFields } from '../../blacklist.utils.js';
+
+@CommandHandler(BlacklistSearchCommand)
+class BlacklistSearchCommandHandler
+  implements ICommandHandler<BlacklistSearchCommand>
+{
+  private readonly logger = new Logger(BlacklistSearchCommandHandler.name);
+  constructor(
+    private readonly settingsCollection: SettingsCollection,
+    private readonly blacklistCollection: BlacklistCollection,
+    private readonly discordService: DiscordService,
+  ) {}
+
+  async execute({ signup, guildId }: BlacklistSearchCommand) {
+    const settings = await this.settingsCollection.getSettings(guildId);
+    if (!settings?.modChannelId) {
+      this.logger.warn('No mod channel set for guild ${guildId}');
+      return;
+    }
+
+    const { modChannelId } = settings;
+
+    // search to see if the signup is in the blacklist
+    const matches$ = this.blacklistCollection.search({
+      guildId,
+      discordId: signup.discordId,
+      characterName: signup.character,
+    });
+
+    const pipeline$ = matches$.pipe(
+      mergeMap(async (entry) => {
+        const channel = await this.discordService.getTextChannel({
+          guildId,
+          channelId: modChannelId,
+        });
+
+        const embed = this.createBlacklistEmbed(entry, signup, {
+          guildId,
+          modChannelId,
+        });
+
+        return channel?.send({ embeds: [embed] });
+      }),
+      catchError((err) => {
+        if (err instanceof EmptyError) {
+          return EMPTY;
+        }
+        throw err;
+      }),
+    );
+
+    await lastValueFrom(pipeline$, { defaultValue: undefined });
+  }
+
+  private createBlacklistEmbed(
+    entry: BlacklistDocument,
+    { reviewMessageId }: SignupDocument,
+    { guildId, modChannelId }: { guildId: string; modChannelId: string },
+  ) {
+    const fields = createBlacklistEmbedFields(entry);
+
+    if (reviewMessageId) {
+      fields.push({
+        name: 'Signup',
+        value: getMessageLink({
+          guildId,
+          channelId: modChannelId,
+          id: reviewMessageId,
+        }),
+        inline: true,
+      });
+    }
+
+    const embed = new EmbedBuilder()
+      .setTitle('Blacklisted User Detected')
+      .setDescription('A blacklisted user has been detected signing up')
+      .addFields(fields)
+      .setTimestamp();
+
+    return embed;
+  }
+}
+
+export { BlacklistSearchCommandHandler };
diff --git a/src/blacklist/subcommands/display/blacklist-display.command-handler.ts b/src/blacklist/subcommands/display/blacklist-display.command-handler.ts
index 660e470f..f64ebf6c 100644
--- a/src/blacklist/subcommands/display/blacklist-display.command-handler.ts
+++ b/src/blacklist/subcommands/display/blacklist-display.command-handler.ts
@@ -1,9 +1,8 @@
 import { CommandHandler, type ICommandHandler } from '@nestjs/cqrs';
-import { type APIEmbedField, EmbedBuilder } from 'discord.js';
+import { EmbedBuilder } from 'discord.js';
 import { BlacklistCollection } from '../../../firebase/collections/blacklist-collection.js';
-import type { BlacklistDocument } from '../../../firebase/models/blacklist.model.js';
 import { BlacklistDisplayCommand } from '../../blacklist.commands.js';
-import { getDisplayName } from '../../blacklist.utils.js';
+import { createBlacklistEmbedFields } from '../../blacklist.utils.js';
 
 @CommandHandler(BlacklistDisplayCommand)
 class BlacklistDisplayCommandHandler
@@ -18,26 +17,15 @@ class BlacklistDisplayCommandHandler
       interaction.guildId,
     );
 
-    const fields = results.flatMap((result) => this.getFields(result));
+    const fields = results.flatMap((result) =>
+      createBlacklistEmbedFields(result),
+    );
 
     // for each result create an Embed field item for it, only displaying the fields that are defined in the document
     const embed = new EmbedBuilder().setTitle('Blacklist').addFields(fields);
 
     await interaction.editReply({ embeds: [embed] });
   }
-
-  private getFields({
-    characterName,
-    discordId,
-    reason,
-  }: BlacklistDocument): APIEmbedField[] {
-    const displayName = getDisplayName({ characterName, discordId });
-    return [
-      { name: 'Player', value: displayName, inline: true },
-      { name: 'Reason', value: reason, inline: true },
-      { name: '\u200b', value: '\u200b', inline: true },
-    ];
-  }
 }
 
 export { BlacklistDisplayCommandHandler };
diff --git a/src/discord/discord.consts.ts b/src/discord/discord.consts.ts
index 7c664c75..3463f802 100644
--- a/src/discord/discord.consts.ts
+++ b/src/discord/discord.consts.ts
@@ -1,9 +1,4 @@
-import {
-  GatewayIntentBits,
-  Message,
-  type PartialMessage,
-  Partials,
-} from 'discord.js';
+import { GatewayIntentBits, Message, Partials } from 'discord.js';
 
 export const INTENTS = [
   // GatewayIntentBits.DirectMessages,
@@ -33,7 +28,7 @@ export function getMessageLink({
   guildId,
   channelId,
   id,
-}: Message | PartialMessage) {
+}: Pick<Message, 'guildId' | 'channelId' | 'id'>) {
   return `https://discord.com/channels/${guildId}/${channelId}/${id}`;
 }
 
diff --git a/src/firebase/collections/blacklist-collection.ts b/src/firebase/collections/blacklist-collection.ts
index a0632e81..c0f1f6e5 100644
--- a/src/firebase/collections/blacklist-collection.ts
+++ b/src/firebase/collections/blacklist-collection.ts
@@ -8,6 +8,7 @@ import {
   first,
   from,
   lastValueFrom,
+  map,
   mergeMap,
 } from 'rxjs';
 import { InjectFirestore } from '../firebase.decorators.js';
@@ -86,6 +87,19 @@ class BlacklistCollection {
     return lastValueFrom(pipeline$, { defaultValue: undefined });
   }
 
+  public search({
+    guildId,
+    discordId,
+    characterName,
+  }: { guildId: string } & Pick<
+    BlacklistDocument,
+    'discordId' | 'characterName'
+  >) {
+    return this.query$(guildId, { discordId, characterName }).pipe(
+      map((result) => result.docs[0]!.data()),
+    );
+  }
+
   /**
    * Query the collection for the given data and emit the first result
    * @param data