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

How do I access webmail?

How do I access webmail?Webmail may be accessed using the following...

How do I set up Outlook or Outlook Express 5?

Start Outlook or Outlook Express. Click Tools and choose Accounts. In the Internet Accounts...

How can I report someone that is spamming me?

If you have an account with us and continue to get spam'd there are a few steps you can take....

What are my mail server names?

Your mail server names are mail.yourdomain.com. The server name will be the same no matter how...

What port does POP3 run on?

Ultra Web Hosting POP3 server runs on port 110. This is important but probably not needed for...