HostMonster Web Hosting Help

421 Unexpected Failure

If you are trying to send emails and get a message like the following, then this could be a temporary issue:

"421, response: Unexpected failure, please try later. "

However, If the message says the following,then the receiving email may have problems:

"No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you."

If you experience this error everytime, please contact HostMonster via live chat or by phone at (866) 573-4678 so we can test your email settings.

Knowledgebase Article 14,011 views bookmark tags: email webmail (updated 788 days ago)


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