Subject: mail bounces (sender-tag?)

From: Marc Owen <[email-masked]>
Date: Sat, 7 Apr 2001 08:02:49 +0200 (MEST)

Hi,

   I have a problem that's been teasing my brain for days now, and I hope
   one of you could help me a bit...

   I use pine to read my email on my computer that's connected to the
   internet with a cable modem. I have a dynamic ip.

   The problem is, when I send a mail to certain hosts (like hotmail -
   and some others, too), my message bounces with the following error
   message:
   ----- The following addresses had permanent fatal errors -----
   <[email-masked]>
   ----- Transcript of session follows -----
   451 <[email-masked]>... cocaine.c17h21no4.net: Name server
   timeout
   ... while talking to mc1.law13.hotmail.com.:
   >>> DATA
   <<< 554 Transaction failed

   554 <[email-masked]>... Service unavailable

   cocaine is my localhost. I suspect that some mta's are configured to
   check the 'sender'-tag, and pine puts my local (internal, fictious)
   domain name there, and the mta can't resolve it obviously.
   When I take "127.0.0.1 cocaine.c17h21no4.net cocaine localhost" out of
   my /etc/hosts (at least the cocaine part), some other programs (like
   wget) complain that they cannot determin local ip address...
   But my mail works to all hosts (sender - tag in pine is marc@cocaine,
   no fully resolvable address).

   When there's "cocaine.c17h21no4.net cocaine" too, everything else
   works (like wget), but mail to certain hosts (hotmail, pandora, ...)
   bounces - while others arrive without a problem.
   The problem is the 'sender'-tag, I think... What should I do? There is
   no option in pine to fake the header tag ('custom headers' doesn't
   work for the 'sender'-tag, it always gets replaced).
   Other people using pine on a host with a dynamic ip must have the same
   problem...

   Marc.

   PS: I use a customized 'from'-line, but that doesn't work for
   'sender'... I hope there is another way to fix this (am I overlooking
   something here?) than to mess with sendmail.cf rulesets...

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From: Nuno Teixeira <[email-masked]>
Date: Tue, 10 Apr 2001 23:18:11 +0100 (WEST)

Hi,

I have the same problem with "From" and "Sender" tags.

I use a bogus domain and the sender is always like "[email-masked]".
I've read the RFC822 to see the differences between the "From" and
"Sender" but it becomes confused when we have dynamic IPs and bogus
machine names.

When I found this problem I put the same question for the sendmail. The
question is: does the email sent by a machine with a dynamic IP and a
bogus name is a valid email message?

Bye,

B
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Nuno Teixeira
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PGP Public Key:
http://www.pt-quorum.com/pgp/nunoteixeira.asc