I use avira and it does not offer email protection
Please note that AntiVir Personal - Free Antivirus does not have Mailguard feature to scan incoming emails for viruses and malware . Outgoing emails can be scanned for viruses and malware by MailGuard.
But in all AntiVir product, the option "Scan when reading and writing" is ticked by default so if an infected file is attached to an email, AntiVir will detected it. Here is an extract of the manual :
If this option is enabled, the Guard scans files before opening, reading and executing and
after writing. This option is enabled as the default setting and is recommended.