I have just setup a new Virtualmin installation on Centos 5.x and everything seems to be working great so far except for my ability to connect to Postfix with Outlook to send mail. In Outlook 2007, pop connects successfully but after about 60 seconds, SMTP (send test email message) fails and provides the following error: Send test e-mail message: The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).
This server is behind a firewall but access rules are setup for IMAP/POP/SMTP and no log messages indicating any firewall blocking. I am not sure what I am doing wrong but suspect a problem with my Postfix smtp configuration/initial setup.
Actually, I am not sure. Can you suggest a method to test SMTP connectivity. I used to know how to do this with telnet but am on Vista workstation at the moment.
I am not as familiar with SMTP blocking but have heard about this. I am the owner/operator of the equipment and hosting rack between me and the server. Basically, my PC ->comcast broadband ->my firewall (my access rules) -> server. I can make any changes necessary myself and I am pretty certain data-center is not blocking anything.