Relaying Issue with external ISP

[CoreyWilson]

Hello all,

We have a few users that are using an ISP that does not allow relaying. When they dial-up through their ISP and access our email server they can receive email but they can not send email to our server through their ISP's dial-up account. Is there anything we can do on our end to allow this? Aside from having the user use OWA or use their ISP's mail server with their work account as the reply-to-address?

Thanks

 

[rjs]

If I understand correctly, you would set the outbound server in Outlook to point to the ISP's smtp server, leaving the inbound still pointing to your exchange server. ISP's don't see this as a relay.

If I've missed something, then the only other option I can think of is a VPN which they could connect to once their dial-up session is established.

R.Sobelman

http://www.tracklogins.com

 

[jimthecanadian]

many ISP's block port 25 to all mail servers except their own. There are a couple of things you can do. You can setup your firewall to redirect some random high port (I use 8025) to port 25 on your mail server.

You can also setup RPC over HTTP