* ESET products will scan POP3/POP3S and IMAP/IMAPS email for the presence of malicious code while using Mozilla Thunderbird 6+ or Windows 10 Mail or other email clients not listed above. Email may not be scanned for spam, however.
ESET is able to check emails both through https protocol filtering and with a dedicated plugin. The plugin only works with Outlook but https protocol filtering does not depend on email client. As others reported, anti-spam filtering only works with the plugin though.