Bounced Mails: Error 550 5.7.1
Tuesday, July 4, 2006 at 10:19 pm
Windows XP Annoyances Discussion Forum
Posted by C. P. Kumar
(47 messages posted)
For past few days, a number of e-mails from outside addresses (like Yahoo! and others)
to our organisation mail addresses are being bounced. The bounced message comes from
Postmaster@... (our ISP) and the error is:
Mailbox unknown or not accepting mail.
550 5.7.1 Unable to relay for xxx@... (our organisation mail address)
Around one month back, we had installed a LAN Proxy Server (Squid). After installing
that, our internet connectivity has improved but the mail problems have started.
I wonder if Squid Proxy is anyway connected with relaying of mails or there is some
problem at our ISP end.
Can you please suggest suitable diagniostics and remedies?
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