Pix Firewall question

I have been having problems sending e-mail to a specific e-mail address.
When I send it to the address from my workstation, I get a NDR error (5.7.1).
However, I can send it from my personal e-mail account.

I understand that having certain ports on a Pix firewall closed can goof up
e-mail. What ports need to be open and how do I check to see if they are?

Malke
Thu Feb 09 11:35:17 CST 2006

Carl Gross wrote:

> I have been having problems sending e-mail to a specific e-mail
> address. When I send it to the address from my workstation, I get a
> NDR error (5.7.1).
> However, I can send it from my personal e-mail account.
>
> I understand that having certain ports on a Pix firewall closed can
> goof up
> e-mail. What ports need to be open and how do I check to see if they
> are?

Since you are apparently referring to a third-party firewall (Pix),
contact their tech support for questions relating to their program.

Malke
--
Elephant Boy Computers
www.elephantboycomputers.com
"Don't Panic!"
MS-MVP Windows - Shell/User

JohnKeating
Thu Feb 09 13:55:39 CST 2006

Old versions of PixOS that have SMTP "Fixup" turned on will trash ESMTP
traffic. Turn SMTP "Fixup" off.

"Carl Gross" wrote:

> I have been having problems sending e-mail to a specific e-mail address.
> When I send it to the address from my workstation, I get a NDR error (5.7.1).
> However, I can send it from my personal e-mail account.
>
> I understand that having certain ports on a Pix firewall closed can goof up
> e-mail. What ports need to be open and how do I check to see if they are?

karl
Fri Feb 10 06:47:01 CST 2006

If you can send email to some addresses but not others, that doesn't sound
like a problem of a port being closed. That would cause all email to fail.
When doing email testing, I would get on your email server [if you have one]
and use TELNET to see what is going on. Google for something like "telnet
smtp helo" to get instructions on what SMTP commands you can type in a
telnet session to send an email and watch what happens. You may also want
to use the "advanced" DNS lookup link at www.network-tools.com to find the
MX mail servers for that domain, to know where to telnet to. But basically
if you telnet to the remote email server successfully, you know right away
it doesn't sound like a firewall problem.


"Carl Gross" <CarlGross@discussions.microsoft.com> wrote in message
news:EF50EC89-E4CC-4966-A855-69921C28E288@microsoft.com...
>I have been having problems sending e-mail to a specific e-mail address.
> When I send it to the address from my workstation, I get a NDR error
> (5.7.1).
> However, I can send it from my personal e-mail account.
>
> I understand that having certain ports on a Pix firewall closed can goof
> up
> e-mail. What ports need to be open and how do I check to see if they are?

Chris
Sat Feb 18 16:35:17 CST 2006

This is most likely a situation where your domain does not have a PTR
record with your ISP combined with reverse lookup turned on at the
senders email server will keep them from performing a successful
reverse lookup on your email server thus preventing you from sending
them email and them from sending you email. This would explain why it
only happens to some email addresses.




.............Chris

cmoorhead@mindspring.com


On Thu, 9 Feb 2006 09:19:02 -0800, "Carl Gross"
<CarlGross@discussions.microsoft.com> wrote:

>I have been having problems sending e-mail to a specific e-mail address.
>When I send it to the address from my workstation, I get a NDR error (5.7.1).
> However, I can send it from my personal e-mail account.
>
>I understand that having certain ports on a Pix firewall closed can goof up
>e-mail. What ports need to be open and how do I check to see if they are?