I just got Postfix 2.9.6 up and running on a Debian 7 Wheezy server and I can send and receive mail to the outside world but I'm unable to login to the SMTP server.
I've tried telnet, first by installing and starting inetd and verifying it is listening on port 23. I've also tried checking SMTP from web apps offered by wormly.com and pingability.com as well as others. All time out.
I also tried to telnet into my box on port 23 and likewise it will time out. From the same machine, I am able to telnet into Google's telnet server. I checked the firewall on my router and nothing is being blocked but I temporarily disabled the firewall anyway.
I thought maybe port 25 is being blocked at the ISP level but why wouldn't the free web clients work? Same thing with being able to telnet into Google's SMTP but not my own.
Any thoughts? Thanks.