Thanks rtg for your very quick response !
I think I just found what caused the problem !
I have two e-mail accounts, both with the same e-mail address firstname.lastname@example.org
provided by ISP (A)
account 1: email@example.com
, POP3 by (A) , SMPT by (A) This is my default e-mail, and I use it at home, where I have services from ISP (A)... So far so good
account 2: firstname.lastname@example.org
, POP3 by (A) , SMTP by (B) This is the e-mail I use at my country home, where my brother has services from ISP (B). ISP (B) doesn't allow me to sent e-mail using SMTP by (A) even if it is SSL authenticated. See the point?
Well, yesterday I sent an e-mail from account 2: of course, since I am in country home. But the attachment was big, and the mail didn't send. So today while receiving back an error message (that is why evolution was trying to Fetch some message ...) It was account 1: (the default one) that was activated...
So I unchecked account 1: and made account 2: the default one ...
Now every message I sent and receive even if it is by myself, does not cause any problems!
The question still remains though.. Why evolution should close after this error? shouldn't It just warn you and let you continue to work with the app?