[ale] [OT] Sendmail (?) woes

[Denny Chambers]

Some mail servers do this. They do lookups on the domain, to make sure 
that it is valid. This is a spam prevention technique I assume.

Joe wrote:

>Hi folks,
>
>I'm trying to send mail to someone at sun.com, but my mail
>is always returned with:
>
>  
>
>>   ----- The following addresses had permanent fatal errors -----
>><andrew.holt at sun.com>
>>    (reason: 501 <joe at orado.localdomain.private>... Sender domain must exist)
>>
>>   ----- Transcript of session follows -----
>>... while talking to mx3.sun.com.:
>>    
>>
>>>>>MAIL From:<joe at orado.localdomain.private> SIZE=1821
>>>>>          
>>>>>
>><<< 501 <joe at orado.localdomain.private>... Sender domain must exist
>>    
>>
>
>Why does my delivery agent say "From:<joe at orado.localdomain.private>"
>when I'm explicitly setting the From: line to "jknapka at earthlink.net",
>(below)? Is this a sendmail.cf thing (shudder)?
>
>Thanks in advance (and hoping I can even send this message),
>
>-- Joe 
>
>  
>
>>501 5.6.0 Data format error
>>Reporting-MTA: dns; earthlink.net
>>Received-From-MTA: DNS; localhost
>>Arrival-Date: Wed, 22 Jan 2003 02:37:00 -0700
>>
>>Final-Recipient: RFC822; andrew.holt at sun.com
>>Action: failed
>>Status: 5.5.2
>>Diagnostic-Code: SMTP; 501 <joe at orado.localdomain.private>... Sender domain must exist
>>Last-Attempt-Date: Wed, 22 Jan 2003 02:37:01 -0700
>>From: Joe <jknapka at earthlink.net>
>>Subject: JKForth
>>To: andrew.holt at sun.com, joe at orado.localdomain.private
>>Date: Wed, 22 Jan 2003 02:37:00 -0700
>>    
>>
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>  
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