IMAP Sending issue from outside firewall. Think it is firewall...stumped?
Posted on 2011-03-10
I have been around MS servers and networking for a long time but am stumped on an IMAP SMTP sending issue.
It's been a few years since i set the original configurations and we never really used IMAP until we have some users with MACs at home so I cannot remember when it last worked, but we don't change that much either.
Inside the firewall my IMAP connections can send fine. Outside the firewall they cannot connect to send, but can receive just fine.
The other thing is we are receiving external mail just fine, but if i try and telnet to port 25, i cannot connect. We have a Sonicwall FW and I have been up and down the configs and can't see anything misconfigured.
Thanks in advance. I am stumped.
I am running a 2003 FE/BE
Authenticated users and certain subnets trusted to relay. This is why it works internally. Externally, since it should accept the authentication, but I think this is where it is failing somehow.