Sorry but even with your answer Vlk, I still get stuck with the setup of multiple smtp servers …

Ok here is what I have in my avast4.ini

DefaultPopServer=my_pop.server.com
DefaultSmtpServer=my_smtp.server.com

Now I have to add the line:
UseDefaultSmtp=0

and I have to activate in my email client the SMTP authentication feature.
Ok it’s done but what now ?
Do I have to add lines (kind of DefaultSmtpServer=my_smtp2.server.com) in order to identify my second smtp server ?

Thanks in advance :wink: