Re: Exim behind dhcp/ipmasq
In article <[🔎] 20010817134252X.mas@kurukshetra.caltech.edu> you write:
>Until recently, my machine had a permanent IP address and DNS name and
>I had no problem using Exim to send mail. Now I am home for the
>summer and we have one DSL line for the whole house, so there is a
>router which lets everyone access the net with an internal IP address.
>Now Exim works most of the time, but there are a few domains that it
>can't send mail to, such as hotmail and sourceforge. When I try to
>send email addressed to an address at these domains, I get "Warning:
>message xxx delayed yy hours" emails and finally "Mail delivery
>failed".
It looks like you are hitting some anti-spam filters on some systems,
but without seeing the error message on your SMTP sessions, I can't
tell. Try seeing if you can set some debug mode to log your entire
SMTP session, or just manually do an SMTP session by telnetting to
port 25 of the system you are sending mail to. (I use sendmail, so I
don't know exim.)
Some systems will verify the envelope from address, and dissalow
connections claiming to be from non-existant domains. Fix your
configuration.
Some systems will insist that your IP has rDNS that matches one of
it's forward DNS entries. Get your ISP to set up proper rDNS for
your address.
Both of the above can be fooled by slow or down DNS servers, so should
return temporary (4xx) failures.
Many systems use MAPS DUL <http://www.mail-abuse.org/dul/> or another
list of dynamic IP addresses, and dissallow SMTP connections from
systems on the list. Use your ISP's mail relay.
This would normally return a permenent (5xx) error.
My mail server filters on all of the above, and more too.
--
Blars Blarson blarson@blars.org
http://www.blars.org/blars.html
"Text is a way we cheat time." -- Patrick Nielsen Hayden
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