[ale] sendmail

[Michael H. Warfield]

Tim Abrahamson enscribed thusly:
> I am having a problem with my sendmail 8.8.4 to wit.. All inbound mail is
> rejected with a 550 error "user not found"

> Users appear to be set up correctly, I can send mail to users internally,
> and I can send mail out.  If anyone might have a suggestion as to what to
> look at I would be very greatful!

	Suggestion #1:  Upgrade your sendmail.  8.8.4 is out of date.
The latest in the 8.8.x line is 8.8.8 and previous versions may have
security problems.  The latest version of sendmail overall is 8.9.3,
which would be the version I would recommend.

	Suggestion #2:  Provide a bounce message to examine.  Send in a
test message and then, when you get the bounce back, send the entire bounce
message.  Reason...  A variety of errors could be occuring, like "permission
denied" or "MX record points to self" or other configuration errors.  Lots
of times, when there is no specific SMTP code for those errors, it ends
up looking like "user not found".  Even a lot of the anti-relay, anti-spam
rules end up doing this.  The bounce message will report "550 user not found"
but the transaction body will have something like "551 we don't relay".
The "550 user not found" is actually being reported by the system one hop
away because the mail got refused for a reason he didn't recognize.

> Tim Abrahamson - Network Administrator
> ThinkWorks, Inc. ; Innovative Group,LLC
> phone:  800.589.3587 ext. 105
> direct:   770.225.2405
> fax:       770.225.2435
> e-mail:   tabraham at innovativesearch.com

	Mike
-- 
 Michael H. Warfield    |  (770) 985-6132   |  mhw at WittsEnd.com
  (The Mad Wizard)      |  (770) 331-2437   |  http://www.wittsend.com/mhw/
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