Email protocols

Enable email protection by protocol filtering - The IMAP and POP3 protocols are the most widespread protocols used to receive email communication in an email client application. ESET Mail Security provides protection for these protocols regardless of the email client used.

ESET Mail Security also supports the scanning of IMAPS and POP3S protocols, which use an encrypted channel to transfer information between server and client. ESET Mail Security checks communication utilizing the SSL (Secure Socket Layer), and TLS (Transport Layer Security) protocols. The program will only scan traffic on ports defined in Ports used by IMAPS/POP3S protocol, regardless of operating system version.

IMAPS /POP3S scanner setup - Encrypted communications will not be scanned when default settings are in use. To enable the scanning of encrypted communication, navigate to SSL/TLS protocol checking.

The port number identifies what type of port it is. Here are the default email ports for:

Port name

Port numbers

Description

POP3

110

Default POP3 non-encrypted port.

IMAP

143

Default IMAP non-encrypted port.

Secure IMAP (IMAP4-SSL)

585

Enable SSL/TLS protocol filtering. Multiple port numbers must be delimited by a comma.

IMAP4 over SSL (IMAPS)

993

Enable SSL/TLS protocol filtering. Multiple port numbers must be delimited by a comma.

Secure POP3 (SSL-POP)

995

Enable SSL/TLS protocol filtering. Multiple port numbers must be delimited by a comma.