On Saturday 08 February 2003 07:07 pm, Adolfo Bello wrote:
> He is receiving messages from the list but he can not post any.
>
> Can somebody give a hand on this?
>
This was happening to me and this is what I found out through some digging 
around and examining headers.  If anybody can correct anywhere I am wrong, 
please do because I would like to understand this better.

When you send a message to sympa, the Mandrake list server, it tries to do a 
reverse lookup on the ip address of the smtp server sending the connection to 
match the smtp domain name against the domain name of the from address.  I 
gather that this technique is to prevent a spam attack from happening.

This kind of thing happens when the mailhost you are sending through is a 
virtual server, meaning there is one numeric ip address for many domains.  In 
this case, sympa cannot do the reverse lookup and quietly rejects the 
message.  I am also a subscriber to Adelphia PowerLink and I cannot use my 
@adelphia.net address to send to the list.  I  must use a POP3 account I have 
on my professional association.  

Another problem with Adelphia specifically is the way they route their mail.  
He may have been allowed by sympa to subscribe, but then the smtp server he 
was using changed because of Adelphia's load balancing, rotation or network 
problems, which sympa does not like.

As long as he is receiving messages, it may be worthwhile to get a free portal 
address at Yahoo or Excite and send messages to the list from there.  He will 
receive the messge back through the list server.  A kludgy workaround, but 
doable.

I have tried sending an e-mail to MandrakeSoft to get an explanation for this 
and no one responded, so this is what I have surmised from the evidence I 
have.  Hope it helps.

-- 
Greg

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