hi eddy thanks for your answer but I don't know where I can increase this timeout and sorry for not searching in the forum but english is pretty hard for me :'(
Your English is pretty well
You can increase the timeout of avast, left clicking the 'a' blue icon, going to Internet Mail Provider, Customize and go to Advanced tab. There is the timeout. I recommend 600 seconds.
For Incredimail, well, I'm not sure but probably into the email account settings (properties) on Advanced tab too