Incoming Port Setting for Mac os X Yosemite 10.1

Hello,

I am using MAC mail 8.1 (Mac os x Yosemite 10.1) and have configured the incoming port setting to 993 (as instructed on the DreamHost wiki page).

However, the port setting keep resetting themselves and I have to manually put in the port setting every 10 minutes as my mail disappears.

Also, mail is not being deleted from the server.

Help!

Thank you,
Pamela

im pretty good with OS X, has your problem been solved?

Yes, thank you.