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

Server Error 0x800CCC90, Error Number 0x900CCC92

There are many reasons for the above error. Make sure you are using username@yourdomain.com...

I am getting an access denied logging into webmail

For webmail, make sure you are using the proper account name when logging in. For webmail it is...

Can I get webmail running on port 80?

Webmail for Horde, Roundcube and Squirrelmail now works over port 80 when using...

Outlook: The Message Could Not Be Sent - An Error Has Occurred

When you try to send an e-mail message, you may receive the following error message: The message...