diff --git a/.env.test b/.env.test
index 77234f4..fd8b358 100644
--- a/.env.test
+++ b/.env.test
@@ -7,4 +7,3 @@ POSTGRES_PORT=54320
 POSTGRES_USER=root
 SLACK_BOT_USER_O_AUTH_ACCESS_TOKEN=SLACK_BOT_USER_O_AUTH_ACCESS_TOKEN
 SLACK_SIGNING_SECRET=SLACK_SIGNING_SECRET
-EMAIL_PATTERNS=@manomano.com,@prt.manomano.com
diff --git a/src/core/services/slack.ts b/src/core/services/slack.ts
index 03f4fc9..1268bab 100644
--- a/src/core/services/slack.ts
+++ b/src/core/services/slack.ts
@@ -2,13 +2,19 @@ import { WebClient } from '@slack/web-api';
 import fetch from 'node-fetch';
 import type { GitlabUser } from '@/core/typings/GitlabUser';
 import type { SlackUser } from '@/core/typings/SlackUser';
-import { getEnvVariable } from '@/core/utils/getEnvVariable';
+import {
+  getEnvVariable,
+  getEnvVariableOrDefault,
+} from '@/core/utils/getEnvVariable';
 import { logger } from './logger';
 
 const SLACK_BOT_USER_O_AUTH_ACCESS_TOKEN = getEnvVariable(
   'SLACK_BOT_USER_O_AUTH_ACCESS_TOKEN'
 );
-const EMAIL_PATTERNS = getEnvVariable('EMAIL_PATTERNS');
+const EMAIL_PATTERNS = getEnvVariableOrDefault(
+  'EMAIL_PATTERNS',
+  '@manomano.com,@prt.manomano.com'
+);
 
 // This client should be used for everything else.
 export const slackBotWebClient = new WebClient(
diff --git a/src/core/utils/getEnvVariable.ts b/src/core/utils/getEnvVariable.ts
index 6830c20..6202de8 100644
--- a/src/core/utils/getEnvVariable.ts
+++ b/src/core/utils/getEnvVariable.ts
@@ -6,3 +6,15 @@ export function getEnvVariable(name: string): string {
   }
   return variable;
 }
+
+export function getEnvVariableOrDefault(
+  name: string,
+  defaultValue: string
+): string {
+  const variable = process.env[name];
+
+  if (variable === undefined) {
+    return defaultValue;
+  }
+  return variable;
+}