Outlook won't work with sbs2003 exchange outside the company.
I have set up an SBS2003 server to use Exchange for e-mail as I have done many times. The problem is that I have users that work from home but when I configure Outlook for the POP3 account with mail.domain.com is incoming and outgoing it doesn't find the server. OWA and e-mail from inside works and MX records are all correct.
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