A reverse lookup on our IP returns our provider address. Several checks on multiple reverse lookup tools websites have all said our reverse lookup is ok. Including AOL and they can be picky as well.
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Question
Verizon blocking mail - have no idea what they are looking for
Basic issue is one of our customers cannot receive mail from us. We are using Exchange with an smtp server in our DMZ. I attempted a direct telnet connection and the following results
220-mr4.ash.ops.us.uu.net ESMTP cf-uu-alterdial-$Revision:
07 13:45:51 GMT
220 Please see http://www.verizonbusiness
olicy
ehlo hermitageins.com
250-mr4.ash.ops.us.uu.net Hello xd1156d52.ip.e-nt.net [209.21.109.82], pleased t
o meet you
250 ENHANCEDSTATUSCODES
MAIL FROM:aroos@hermitageins.co
550 5.0.0 Denied: bad-c
It looks like the error message is being truncated. Verizon will not help as we are not customer and the customer is not getting very far with them. Does anyone know if there is something they are looking for that we might not have set correctly. We don't have this issue with any other customer.
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Answers
You have A reverse DNS, although I wouldn't call it valid.
Name: xd1156d52.ip.e-nt.net
Address: 209.21.109.82
That looks like a generic reverse DNS address.
Speak to your ISP and get it changed to mail.hermitageins.com
I would also suggest that you switch your MX records so that mail.hermitageins.com is the lowest cost. hermitageins.com I would usually expect to be pointed to the web site.
Simon.
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by: inbarasanPosted on 2007-12-19 at 05:55:41ID: 20499497
Do you have reverse DNS setup for your SMTP gateway. Some of the firms have enabled this setting that SMTP server which tries to send mail should have reverse DNS entry else they reject the mail. Check this one