Re: Exchange 5.5 Port 587

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LANengineer wrote:
> One of our companies is having a problem with mail being sent to AOL
> being rejected because of the use of SMTP port 25.

That's the port SMTP uses by default, though.

> The recommend
> using port 587 to work around this.

Sounds like they think you're just trying to configure a POP/IMAPmail client
to access an SMTP server over an alternate port, not configure a mail server
at all. NB: This misguidance is not atypical of AOL support, although I
don't know exactly what someone asked them, of course.

> However, they are using an
> Exchange 5.5 server. How can I change the default port in Exchange
> in 5.5 to use 587 instead of 25?

Well, do you want to send Internet e-mail to anyone, you'd better send it on
port 25, because that's what the recipients' mail servers (including AOL's)
are listening on. That's how SMTP talks.

> Now if the user exits out of
> Outlook and strictly uses Outlook Express (which obviously doesn't
> route through the Exchange server) they can send. They don't want to
> use the two programs to achieve this - they want to run it all
> through Outlook/Exchane.
>
> Any ideas?

There is another reason AOL is rejecting mail from your server. Maybe your
public IP doesn't have a reverse DNS / PTR. Maybe you're an open relay, or
someone thinks you are, and you're on a blacklist. Maybe the server/network
is on a dynamic public IP address, and you're on a blacklist. AOL is very
picky - what is the exact text of the NDR/bounce message the Exchange sender
receives upon sending to an AOL address?

Look up your Internet domain at www.dnsreport.com for additional clues. You
might be able to forward all Internet-bound mail to your ISP's SMTP server
and have *them* handle the rest ... this is often a necessity, esp. with
regard to being on a dynamic IP. It isn't just AOL who is picky.


.

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