Wang, Mary Y wrote:

Hi, 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 sendmail.mc file and have also recompiled it to produce the sendmail.cf. I also restarted the sendmail service.

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telnet ana.boeing.com 25 Trying 134.51.151.114... Connected to ana.boeing.com (134.51.151.114). Escape character is '^]'. 220 ana.boeing.com ESMTP Sendmail 8.12.11.20060308/8.12.11; Sat, 1 May 2010 16:39:06 -0700 helo ana.boeing.com 250 ana.boeing.com Hello ana.boeing.com [134.51.151.114], pleased to meet you mail from:root@ana.boeing.com 250 2.1.0 root@ana.boeing.com... Sender ok rcpt to:mary.y.wang@boeing.com 550 5.1.1 mary.y.wang@boeing.com... User unknown

Any ideas? I'm running on Sendmail 8.12.11

Is ana.boeing.com your machine, the relay, or the target MX receiver? Whatever it is, it thinks it should be able to deliver mail to boeing.com locally, but doesn't have a mary.y.wang user or alias.