App for mail alert via phone offline

You're looking for an app that can send you email alerts even when you're offline or without internet connectivity. Here are some options:

Pushover (iOS, Android): This app uses a push notification service to send you alerts even when you're offline. You can set up custom notifications for your email accounts.
Email Alert (iOS, Android): This app allows you to set up custom email alerts for specific keywords, subjects, or senders. It also supports offline notifications.
Notify (iOS, Android): This app sends you notifications for new emails, even when you're offline. It supports multiple email accounts and has customizable notification settings.
Email Notifier (Android): This app sends you notifications for new emails, even when you're offline. It supports multiple email accounts and has customizable notification settings.
Offline Email Notifier (Android): As the name suggests, this app sends you notifications for new emails even when you're offline. It supports multiple email accounts and has customizable notification settings.
Gmail Notifier (Android): This app sends you notifications for new Gmail emails, even when you're offline. It's a simple app that gets the job done.
Microsoft Outlook (iOS, Android): While not specifically designed for offline email alerts, Microsoft Outlook does offer offline support for email notifications. You can set up custom notifications for specific folders or senders.

Before choosing an app, consider the following factors:

Compatibility: Ensure the app is compatible with your email provider (e.g., Gmail, Outlook, Yahoo).
Customization: Look for apps that allow you to customize notification settings, such as filtering by keywords or senders.
Offline support: Make sure the app can send you notifications even when you're offline.
Additional features: Some apps may offer additional features, such as email management or organization tools.

Remember to always check the app's reviews and ratings to ensure it's reliable and effective.