Contact TDS Metrocom and ask if they have started blocking port 25. ISP's typically do this to prevent their users from being spammers.
If Metrocom is blocking port 25 then you have 2 options. Ask catalog.com to open another listener port on their email server. I use port 2525. This is rarely blocked and works great as it is actually an old email port anyway. The other option is to setup a "sending" account using metrocom's email server in PowerMail that has your work return email address for when you are sending email from home.
