will Avast also protect networked PC's ?

[vojtech]

If you add this line
Log=20
to the file avast4.ini under [MailScanner], you can see what mail servers are connected in the log file (Avast4\DATA\log\aswMaiSv.log).

[Goner]

OK, the extended logging helped me to understand what happened ... i was trying to send mail from 1 account thru the the wrong SMTP server (ie : mail-relay !).

POP is working fine, i'm using a DefaultPopServer= for the account i use most and for the other account i use username@pop3.myisp.com.
mail retrieval works OK, don't have to be connected to the right ISP.

for sending mail, i also use a DefaultSmtpServer= for the default account, and for the other account i marked the authentication checkbox in Outlook Express and as user typed #smtp.myotherisp.com (as described in the help). of course i have to be connected to the right ISP (otherwise ; mail relay warning !)

[Lisandro]

Of course i have to be connected to the right ISP (otherwise ; mail relay warning !)

Of course, if you connect to a different ISP you could have different authentication rules...