======ISP needs you to connect on port 587======
Some ISPs will need you to send mail using port 587, instead of port 25.

Port 587 is the '[[http://tools.ietf.org/html/rfc4409|SMTP Submission]]' port which is commonly used instead of, or as well as, the standard SMTP port 25 for when users are sending mail to a smart host/relay server. 

To tell VPOP3 to use port 587, in the SMTP Relay Servers box, type the SMTP relay server name, followed by ":587", eg **smtp.gmail.com:587**

{{:how_to:smtp587.png?nolink|}}

This information is also provided if you hover over the hint '?' symbol next to the entry box.