Resolving/routing e-mails.

[Grenage]

Greetings,

Our mailserver currently works just fine, both internally and externally. If a client wishes to download their messages via POP3 their client simply checks mail.ourdomain.com. Internally, the clients simply check using outlook at mailserver.domain. That's just peachy.

However, now that we have salesmen using tablet PCs both in and out of the office, I thought it would be a good idea for the client to check for mail using the LAN connection when it was available. I (foolishly) assumed that since the client was looking at mail.ourdomain.com, when they were on the LAN and were using our DNS servers, mail.ourdomain.com would resolve to the mailserver as usual and be routed internally.

This is true, it does instantly resolve to our public IP address, but SMTP/POP3 connections are refused. Has anyone ever come across this before, or knows why they might be refused?

Much obliged for any assistance.

Russell.

Carlsberg don't run I.T. departments, but if they did they'd probably be more fun.

 

[lhuegele]

What is your mail server, Exchange? If so perhaps this question would be better posted in that forum.

What firewall does your company have in place? Perhaps the POP and SMTP ports are being blocked at the firewall.

Consider setting up VPN for your remote users. This will allow them to use their computers remotely as if they were in the office.

Good luck,

 

[Grenage]

Thank you for your response. I posted this here, because I do not believe it to be a problem pertaining to Exchange. We have firewalls in place, but this is internal resolution and definitely not the problem.

We do have many VPN clients, but this is simply e-mail access via POP3 when on the local network; it wouldn't really help.

Carlsberg don't run I.T. departments, but if they did they'd probably be more fun.

 

[Cstorms]

Possible acl setup in ISA (if thats what you use) port blocking for internal traffic. If you are able to receive pop3 outside of your network than I would bet that port 110 (if thats the one you use) is somehow being blocked against at your router.

 

[Grenage]

Hi, Cstorms.

We do have an ISA server, but it's merely used as an internet cache (I dislike software firewalls). I am beginning to suspect that traffic is being refused by our Ciphertrust box as part of it's connection control rule set.

Regards.

Russell.

Carlsberg don't run I.T. departments, but if they did they'd probably be more fun.