Well avast handles the secure communication if it is required for your email.
So any accounts in your email program (which is ?) would have a corresponding entry in the SSL Accounts section of avast.
On occasion you may see settings here that aren't in your email accounts, the IP address is actually carrierzone.com also. I have BT Internet email accounts, and I see SSL Accounts entries for Yahoo.com because BT Internet's email is handled by Yahoo.com. So I don't know if there is a similar arrangement free.fr for carrierzone.com ?
Are any of these entries in the SSL Accounts section for those accounts showing they are encrypted ?
You can delete the entries and reboot and see if avast recreates them ?
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Avast will monitor any outbound email from your system even if this could be a spambot, but I think that unlikely or avast is likely to detect multiple emails in a period of time and alert (did that happen ?)
What is your firewall ?
