read this it may help

Well here we go

Im using MS outlook and aol

in ms outlook >>tools >>accounts >> properties >> advanced >> outgoing mail (smtp): default port is 25, aol recommends 587, so times ago, I entered 587 (for france)

Hense in avast >> resident protection >> webshield >>personalized >> port http: I replaced 80 by 587

it also works with 25