Ports changed Comcast Cannot receive mail

A couple of days ago Comcast blocked the 995 SL port I was using for outgoing mail (Mail 3.6), and told me to change it to 587, which I did. Outgoing mail began to work, but immediately incoming mail stopped on both of my POP accounts. I have tried changing the port to 110, turning SSL on and off, but nothing. Since I am not using Comcast email, but rather my university account, Comcast says it is their fault. But I have another POP account, which is acting just the same way. I can still send and receive mail on the university website using Safari.
I am confused about the port number in the advanced pane of the accounts preferences. Does this apply only to outgoing mail? How does one specify an incoming port (which Comcast says should be 110)? Is there some port problem inherent in Mail?
Thanks for any ideas.

Port 995 is used for Incoming mail, while Port 587 is used for Outgoing mail. If your email won't work, then you need to change the Incoming port to one that works, such as 110 or 995. You need to check with your email provider (your University IT department, and for your other POP account) to see which settings they each requre for Incoming mail), then change your preferences to match for each of those email accounts in Mail.
The Advanced pane of Mail preferences only deals with Incoming mail, not outgoing. And there is no problem inherent in Mail; the program has been around for more than 20 years and it works very nicely.

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