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.
----------------------------------------------------------------------------------------------------------------------------------------------------
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:r...@ana.boeing.com
250 2.1.0 r...@ana.boeing.com... Sender ok
rcpt to:mary.y.w...@boeing.com
550 5.1.1 mary.y.w...@boeing.com... User unknown

Any ideas?  I'm running on Sendmail 8.12.11

Mary



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