From: ankush grover (grover.pixgmail.com)
Date: Tue Oct 10 2006 - 08:19:46 CDT

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On 10/6/06, Andreas Winkelmann <mlawinkelmann.de> wrote:
> Am Thursday 05 October 2006 06:12 schrieb ankush grover:
>
> > > The only Reason I see for that is something in between the Client and the
> > > Server which "fixup"s the SMTP-Traffic.
> >
> > I have Pix Firewall running for the LAN protection and the Mail
> > server(Fedora Core3) is in LAN but that server(FC3) is accessible
> > through Internet. The MailGuard (Mail Server Protection) is enabled
> > Pix Firewall.
>
> Use a diffrent Port than 25 to connect from your Client to the Server. AFAIK
> this Cisco-Crap does only FixUp SMTP-Traffic on Port 25.
>
> Maybe use the submission Port in Postfix.
>

there are 2 ways of getting rid of this problem

a) no fix smtp 25 (disabling mailguard on pix)

b) mapping port other than 25 to port 25 of the Mail Server for example

static(inside,outside) externalip portnumber(51000) internal/lan
ipaddress 25 255.255.255.255 0 0

Remote email clients will connect to port 26.

I haven't tried the option b but may work.

The other option is port submission (587) . Will the email clients
need to connect to the port 587(LAN and Remote email clients) or they
will continue using port 25.

Thanks & Regards

Ankush Grover

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