It started yesterday, when anyone tried to email a user on my imail server it bounced back a notice; (Permanent Failure: 553_sorry,_that_domain_isn't_in_my_list_of_allowed_rcpthosts_(#5.7.1)http://www.dnsreport.com/tools/mail.ch?[EMAIL PROTECTED] shows that your MX records are seriously broken (and, a reminder for everyone reading this -- MAKE SURE YOUR BACKUP MAILSERVERS ACCEPT YOUR MAIL!). This is probably one of the most serious common mailserver problems. It's serious since it causes E-mails to bounce with "No such user" or other similar messages (perhaps causing your users to think you are out of business), and prevents the E-mail from being delivered (if you have a single MX record, mail will at least be re-tried). It's common, because lots of people put in MX records that either they shouldn't put it, or don't pay attention when their ISP stops acting as a backup for them.
Delivery last attempted at Thu, 26 Dec 2002 05:53:50 -0000)
I check the knowledge base to try to fix this and the only thing I found was the SMTP Reply Code
553 - Requested action not taken: mailbox name not allowed
I finally reboot and everything started working fine again. Can anybody give me an ideal why this happen and how I can profit this from happening again.
In this case, you can fix the problem by removing the bogus MX records.
-Scott
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