Re: Unable to connect to SMTP over internet

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From: Lanwench [MVP - Exchange] (lanwench_at_heybuddy.donotsendme.unsolicitedmail.atyahoo.com)
Date: 07/16/04 

Date: Fri, 16 Jul 2004 09:52:43 -0400

Are they using the correct server name or IP address? As in,
mail.yourcompany.com, or whatever your public DNS has set up for your public
IP as an A record?

Allen wrote:
> Hi.
>
> I have a strange problem that I hope someone here might
> have experienced or knows how to fix.
>
> I have an E2K on a W2K (both SP3) running behind a
> firewall. both ports 25 and 110 are open and have a rule
> to forward request via these ports to my Exchange server.
> POP3 clients are able to connect from the internet and get
> their emails. other mail servers across the internet are
> also able to connect to it for mail distribution (which I
> assume means that communication over port 25 is working).
> However, when a client is trying to connect the SMTP for
> send email via my mail server thet get the message that
> the mail server cannot be contacted on port 25.
>
> I did close my mail server for open relaying, but enabled
> the option to always allow sending messages with
> authentication. it works without a problem internally, and
> users from within my network are able to send emails using
> my exchange server when they set their mail program to
> send a user name and password in order to send an email,
> but it just not working from outside the internet.
>
> Thanks,
>
> Allen

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