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 14,754 views bookmark tags: email webmail (updated 845 days ago)


Was this resource helpful?

Did this resolve your issue?


Please add any other comments or suggestions about this content:





Recommended Help Content

Explanation why the error occurs in Browser and solutions (updated 838 days ago)
Knowledgebase Article 18,853 views tags: email mac webmail

How to access your email accounts from your web browser. Our webmail applications make a nice alternative to a desktop email client. (updated 38 days ago)
Video "How-to" Tutorial 166,083 views tags: email imap mail webmail

Explanation of what the error's source is and what to do to correct it. (updated 25 days ago)
Knowledgebase Article 98,979 views tags: email webmail

Related Help Content

We provide several programs to be able to check your email online. cPanel Mail section where Email Accounts icon is located Navigate to the Mail section inside cPanel. Click the Email Accounts icon. (updated 37 days ago)
Getting Started Article 305,679 views tags: button cpanel email select webmail

How do I use webmail? (updated 776 days ago)
Knowledgebase Article 321,608 views tags: email webmail

Explanation of the likely cause of being unable to re ceive email from a subaccount or a form (updated 832 days ago)
Knowledgebase Article 10,982 views tags: email webmail

How does a person change the Password, create an Autoresponder and setup Email Filtering on their individual email account without logging into the main account control panel? (updated 369 days ago)
Knowledgebase Article 112,914 views tags: email webmail

Trying to send out emails from multiple email accounts fail from both webmail and third party email clients. Possible Reasons: The maximum emails per hour has been exceeded. This can be caused by forw (updated 25 days ago)
Knowledgebase Article 244,527 views tags: email exceeded mailbox outlook quota receive receiving send sender squirrelmail unable

General Instructions on how to use the spam folder with webmail (updated 853 days ago)
Knowledgebase Article 31,071 views tags: email spam spamassassin webmail

Description of what the error means and how to fix it. (updated 187 days ago)
Knowledgebase Article 18,508 views tags: email webmail

An expanded explanation of what the main mail sub folders are, such as cur, new and tmp. (updated 847 days ago)
Knowledgebase Article 17,688 views tags: directory email webmail