i noticed when i had Avast AntiVirus an msn messenger booting at the same time (when windows xp professional + sp1 is booting) that msn messenger checks for email an then Avast says port 25 already inuse an something bout cant protect email or something…
If the POP(3), SMTP or IMAP port is already used by another program,
you need to change that port numbers. The default values are:
POP(3) - 110
SMTP - 25
IMAP - 143
It is necessary to change that that ports, otherwise avast! can scan
your mail - you can increase the numbers e. g. by one.
Close your Outlook Express
In Notepad open the file AVAST4.INI (it is in
C:\PROGRAM FILES\ALWIL SOFTWARE\AVAST4\DATA)
Into the section [MailScanner] insert these rows (or change them,
if they already exist):
SmtpListen=127.0.0.1:26
PopListen=127.0.0.1:111
ImapListen=127.0.0.1:144
Save the file
Start Outlook Express
Choose TOOLS → ACCOUNTS
Select your mail account and press PROPERTIES
Select ADVANCED
Change the port numbers to the same values as in step 3)
Confirm changes
Restart your computer
NOTE: This is an example for Outlook Express! If you use different e-mail client, the procedure is similar.