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"Wang, Mary Y" 05-02-2010 01:21 AM

Sendmail Configuration Problem - 550 5.1.1 - User unknown Problem
I'm having this Sendmail configuration problem and stuck. I've been doing googling/reading posts and none of the solutions matched my problem.
I'm doing some testing, and have been getting this 550 5.1.1 ....User unknown error when I send the email to my company's email address. When I send it to an external email address, such as yahoo, the message delivered successfully. Of course, I'm doing the configuration behind a firewall. I'm using a relay too, and I did declare the relay host in 'SMART_HOST' in the file and have also recompiled it to produce the I also restarted the sendmail service.
telnet 25
Connected to (
Escape character is '^]'.
220 ESMTP Sendmail; Sat, 1 May 2010 16:39:06 -0700
250 Hello [], pleased to meet you
250 2.1.0 Sender ok
550 5.1.1 User unknown

Any ideas? I'm running on Sendmail 8.12.11


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