Your IP address appears not to be an email server.

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#1 Mon, 06/14/2010 - 12:25
sfischer

Your IP address appears not to be an email server.

Hi,

I have a client that just received this message back after sending to one of their clients. This is the first time I have ever seen this. I followed the link that is provided below and I don't think that my setup is wrong, but I could be wrong. I have never had another client report this to me, and I haven't ever seen a message like this. I googled and found a few things about being black-listed, but I checked my server IP and it wasn't on any list.

This is from the returned mail.

host mx01.domain.ca[69.176.191.101] said: 550-Your message was rejected by this user and was not delivered. 550-Reason: Your IP address appears not to be an email server. 550-Protection provided by: MagicMail version 1.2.2 550-For more information, please visit the URL: 550-http://www.linuxmagic.com/best_practices/check_dynamic_reverse_dns.html

All help greatly appreciated.

Thanks!

Shanon

Mon, 06/14/2010 - 12:35
andreychek

I haven't run into that error before either... however, it's possible receiving server is rejecting it after comparing the sending users IP to a set of blacklisted IP's. Perhaps the sender is sending directly from their dynamic home IP, rather than relaying through a mail server?

Some blacklists reject email unless it's relayed through an email server of some sort.

-Eric

Mon, 06/14/2010 - 13:50 (Reply to #2)
sfischer

the email came from my server, which of course uses Virtualmin and should be setup correctly. I haven't had a problem, other than setting up the smtp server, with the emails. Now, my IP address is dynamic, but it is leased to me on a permanent basis. Maybe that has something to do with it.

Reading further into the email, the sender did write, If you are having a problem accessing my e.mail, please call and advise me. So this may be a new thing on their end. I will ask the client to contact the recipient.

Thanks!

Shanon

Mon, 06/14/2010 - 17:51
andreychek

It's possible that, regardless of what you're paying for, that your IP has been listed as dynamic/residential by a blacklist somewhere.

I'm curious, for example, if your IP shows up on any of the lists here:

http://www.anti-abuse.org/multi-rbl-check/

Tue, 06/15/2010 - 13:28 (Reply to #4)
sfischer

not on any of the lists. Must be a configuration thing on their clients end.

Thanks for the help!