From: Jason Ledford (jledfordbiltmore.com)
Date: Fri Jan 11 2008 - 08:32:31 CST

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I can't seem to get a response from the admins at the problem site. But after some trouble shooting it seems to be related (and I could be completely off) to my ptr records for my ip compared the domain in my outgoing emails. My ptr records for my outgoing ip address is autodiscover.mydomain.com rpc.mydomain.com and mail.mydomain.com and the address in my outgoing email is mydomain.com. Everything works as normal except for this domain. If I telnet from my outgoing mail server to this site I can do:

Helo mail.mydomain.com (or any of my ptr records work)
Mail from:jledfordmail.mydomain.com (or any of my ptr records work)

If I use mydomain.com it never works no matter what I put in for the helo. Our main site mydomain.com isn't on this ip address and so I don't think I could put a ptr on for that name at my mail server ip address.

So am I completely misunderstanding ptr and email, or does this site require a matching ptr for your tld name in outgoing email?

Hopefully someone can help.

-----Original Message-----
From: Terry Carmen [mailto:terrycnysupport.com]
Sent: Thursday, January 10, 2008 12:40 PM
To: Jason Ledford
Cc: postfix-userspostfix.org
Subject: Re: 554 transaction failed lack of security

Jason Ledford wrote:
>
> Hello all,
>
>
>
> I am getting this message when trying to send an email to a specific
> domain
>
> <fakeuserfakedomain.com>: host mail3.fakedomain.com[XXX.XXX.4.26]
> said: 554
>
> Transaction Failed Sender Refused due to lack of security (in reply to
>
> MAIL
>
> FROM command)
>
>
>
>
>
> What exactly does this mean. What security are they looking for? If
> you need any more information from me I would be happy to give it.
> This is also only happening for this domain, all other mail is flowing
> as normal. I can telnet to the mail server in question but as soon as
> I enter the mail from command it gives me that error. Any help would
> be appreciated.
>

The error code means the other system doesn't want to talk to you. The
server might require TLS or other security or authentication, however
the reason could be almost anything.

You would need to contact the postmaster or admin for that system for an
actual explanation.

Terry

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