Ubuntu :: Evolution - Constantly "fetching Mail" At 0%

I'm using evolution for a few POP-email-accounts, and most things work fine (sending and receiving email, sorting into folders etc).

However, evolution permanently displays a row reading "fetching mail" at the bottom of the window, most times the row is splitted into two or three "fetching mail" - probably representing activity for seperate email accounts though it never tells which one is which.

Strange enough this "fetching" hardly ever stops, evolution remains "fetching" for hours(!) at "0% complete", even when all new mails (usually just a hand full per day) already have been downloaded and displayed.

For several reasons I leave all my mail on the server as well, this means there are lots of mail on the server which I downloaded, read and deleted (locally!) in evolution.

I GUESS that evolution keeps checking and downloading old mails left on the server just to dispose them instantly again when the program discovers that these mails already have been read and deleted locally. Is that possible? Any other explanation?

The problem is that I'm paying for internet by "megabyte" (no flat-rate), and apparently evolution DOES download lots of data that I never get to see, i.e. without any use but at a cost.....

Is there any option in evolution to make it just check and download the latest, never before downloaded mails, and then stop "fetching"?

Is there any option in evolution to check on account at a time? (clicking "send/receive" button makes evolution check all accounts as far as I understand).

Is there a possibility to just send mails in the outbox, without, at the same time, checking mail (I only have the combined "send/receive" button.