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Old 12-29-2003, 11:13 AM   #1
papasan
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Registered: Sep 2003
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Unhappy ISP (Verizon) Blocks Mail Forwarding


howdy. trying to get a mailling list going but i'm having a technical snag. here's my situation...

AOL and other ISPs will reject mail from dynamic IP blocks. fair enough, so i set up postfix as 'relayhost = outgoing.verizon.net', i set up SASL to authorize me as 'xxx@verizon.com' and everything seems to be working great.

the snag comes when someone with a verizon mail address sends to the list, when this happens mailman processes te mail and postfix tries to forward it to the recipients but verizon rejects it saying...
Quote:
Dec 29 11:59:38 matron postfix/smtp[2905]: 041F01FD4: to=<yyy@verizon.net>, relay=outgoing.verizon.net[206.46.170.8], delay=1, status=bounced (host outgoing.verizon.net[206.46.170.8] said: 553 You are not authorized to send mail as <yyy@verizon.net> (in reply to end of DATA command))
...where 'yyy@verizon.net' is the original sender of the email.

i've tried playing with the settings for mailman, stripping the headers and whatnot, but it won't work. i've tried using majordomo but i get the same errors with that one.

so how can i have my cake and eat it too? how can i relay mail through outgoing.verizon.net in order to make ISPs like AOL happy and not get my mail rejected because verizon thinks i'm trying to spoof another user?

thanks in advance.
 
Old 12-29-2003, 11:32 AM   #2
peter_robb
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Location: Szczecin, Poland
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It's called a domain name... specifically an MX record in dns.
with a domain name you get an ip number that can be resolved back to the mail server you are using...

or you can borrow/use someone's 2nd/3rd MX server dns record and get them to point to you.

If your problem is your dynamic numbering, how does the list address itself?
 
Old 12-29-2003, 11:43 AM   #3
papasan
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i have a domain name, i have an MX record for the domain. ISPs still block mail servers based on IP numbers. i don't think very many check if you have a legit domain name or not they just block entire IP blocks.

unfortunatly my MX is a CNAME and not an A, but that's what i have to work with. do you think AOL and others are blocking me because 'mail.mydomain.net' is pointing to 'mydomain.net'?

even if i could send all mail directly i would still favor a relay, i think. using a relay takes all the work off of my server in trying to track bounces, retrying mail to down servers, etc.
 
Old 12-29-2003, 11:54 AM   #4
peter_robb
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So long as your mail record resolves back to your ip number, they would only get shirty if the hostname on your box was different from the MX name..

I have no difficulty sending mail to their servers, so long as it's to mail destinations they have, rather than using them as a relay or relayhost.
 
Old 12-29-2003, 03:24 PM   #5
papasan
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i'm not tying to relay mail through them, only send it to them, and for me it bounces.

my domain is on-rope.net, you can look for yourself as it seems you do not believe me.
 
Old 12-29-2003, 04:03 PM   #6
peter_robb
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Location: Szczecin, Poland
Distribution: Gentoo, Debian
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Oh, I'm not questioning your error messages!

Just trying to find out what they don't like in your transmissions..
Could you send something to my server so I can look at the headers etc?
 
  


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