Unroutable mail domain

This can occur for several reasons.

Make sure you have the proper spelling of the email address and no extra spaces.

The recipient mail server may be having problems.

If you have sent more than 150 emails in an hour this will occur. Accounts are limited to 150 emails an hour to limit spam abuse. You will want to throttle the application to 150 an hour or perform 150 at a time.
  • 458 Users Found This Useful

Was this answer helpful?

Related Articles

Greatly Reduce SPAM

This knowledge base article is filled with great tips on setting up your account to reduce 99.9%...

Updating Outlook SSL Certificate

You may want to install SSL for your email or update an existing certificate you had installed...

Setup email on Android device

To setup email on Android first open your device's email app. If you already have an email...

Importing and Exporting Email in Horde

Exporting Your Emails from Horde In the navigation menu at left click on your general...

Do you support IMAP?

Yes! We support IMAP. You can also set your mailbox to whatever size you like, which uses your...