Why Can’t I Send Email When Using Certain Internet Connections?

These days we all expect our email to work flawlessly when we're outside of the office, regardless of how we're connected. Occasionally though, a change of connection is all it takes to cause issues. In this post I take a quick look at why, if you connect to your own mail server using an SMTP connection (not applicable to ActiveSync users) from your mobile device, laptop or even desktop machine, you might experience problems with sending email. Oh, and what you can do about it of course!