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

Outlook: A Filtering Error Has Occurred -199

When you open Outlook Express 4.5 for Macintosh, or you attempt to send or receive mail, you may...

Why can I not send email?

It is possible your internet service provider may be blocking you from sending email outside of...

Server does not support TSL Connections

I received an error message when checking my email "Server does not support TSL Connections."...

What is the path to sendmail?

We are currently running a custom version of sendmail. /usr/sbin/sendmail

cPanel and Outlook Phone App Results in Unable to Log In - Secure Connection Unavailable

It appears the free Outlook app for iOS and Android phone does not support newer SNI based...