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Using account add-ins

Auth-Email's Personal and Pro plans support optional add-ins that enhance or modify the way your email accounts behave when accessed via IMAP or SMTP. These are especially useful for improving compatibility with certain clients or email providers, and for enhancing specific use cases like testing, privacy, or automation.

This guide explains what each add-in does and how to enable or disable them per account.

How add-ins work

  • Add-ins are opt-in features you can toggle individually for each email account in your Auth-Email dashboard.
  • They affect how Auth-Email proxies IMAP or SMTP traffic — modifying commands, headers, or message handling behavior behind the scenes.
  • Add-ins apply only to the protocol specified (IMAP or SMTP) — they don't affect webmail or other interfaces.

📥   IMAP add-ins

These add-ins affect incoming mail and how your client sees and searches messages via IMAP

1. Skip sent message uploads

Prevents your email client from uploading a second copy of messages to the “Sent” folder if your provider (e.g., Gmail, Outlook) already does this automatically. With this add-in enabled, you can avoid seeing duplicate sent messages, especially in clients like Thunderbird or Apple Mail that try to upload their own sent mail copy.

Recommended for: Gmail, Outlook, Yahoo, Fastmail users

Restores original URLs in messages that have been rewritten by Microsoft Defender Safe Links (used by Outlook / Exchange accounts). Get back readable, clickable links in your IMAP client instead of long, mangled URLs like https://nam01.safelinks.protection.outlook.com/?url=...

Recommended for: Microsoft 365 / Outlook users who access email via IMAP

3. Fix search quirks

Some mail clients and scripts are affected by Outlook's inconsistent IMAP search results due to its case-sensitivity and incomplete flag handling. This add-in improves Outlook IMAP search behavior to work better with uppercase characters and return IMAP flags in search results.

Recommended for: Microsoft 365 / Outlook power users, custom clients, email automation scripts

📤   SMTP add-ins

These add-ins modify outgoing messages sent through Auth-Email's SMTP servers.

1. Remove client identifiers

Improve privacy, reduce fingerprinting, or standardize outgoing mail when using shared or automated tools. This add-in removes identifying SMTP headers like:

  • User-Agent
  • X-Mailer
  • X-Originating-IP

Recommended for: Privacy-focused users, automation, shared or public machines

2. Disable Outlook reactions

Because there is no standard specification for email reactions, Outlook automatically sends you an email when its users add emoji-style acknowledgments to your messages (👍 ❤️ 🎉 etc). This add-in enables a special header to prevent users from doing this.

Recommended for: Businesses, transactional systems, formal communication

3. Black hole

This modified SMTP server accepts messages, but silently discards them without delivering. Great for testing email sending, checking integration workflows, or staging environments where you don't want real mail to go out.

Recommended for: Developers, QA teams, CI/CD testing environments

How to enable add-ins

All add-ins are disabled by default for new accounts. To enable or disable them:

  1. Visit your Auth-Email dashboard.
  2. Expand the configuration panel for the account you want to modify
  3. Click "IMAP add-ins", and toggle each feature on or off in the popup panel
  4. Click "SMTP add-ins" and select your desired behaviors
  5. Changes take effect immediately for new connections

ℹ️   Add-ins are per-account and do not affect other accounts you've configured.

Looking for more?

Have you got an idea for a new add-in that Auth-Email could integrate? Email us at support@auth-email.com with your use case, and we'll work with you make it happen!