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Mailbox protection

Integration of ESET Security Ultimate with your Mailbox increases the level of active protection against malicious code in email messages.

To configure Mailbox protection, open Advanced setup > Protections > Email client protection > Mailbox protection.

Enable email protection by client plugins—When disabled, protection by email client plugins is turned off.

Select emails to scan:

Received email

Sent email

Read email

Modified email


We recommend that you keep Enable email protection by client plugins enabled. Even if integration is not enabled or functional, email communication is still protected by Mail transport protection (IMAP/IMAPS and POP3/POP3S).


Scan for spam

Unsolicited email, called spam, ranks among the greatest electronic communication problems. Spam represents up to 30 percent of all email communication. Email client antispam serves to protect against this problem. Combining several email security principles, Email client antispam provides superior filtering to keep your inbox clean. For spam detection, one important principle is recognizing unsolicited emails based on pre-defined trusted addresses (allowed) and spam addresses (blocked).

The primary method used to detect spam is scanning email message properties. Received messages are scanned for basic antispam criteria (message definitions, statistical heuristics, recognizing algorithms and other unique methods), and the resulting index value determines whether a message is a spam or not.

Enable Email client antispam—When enabled, received messages will be scanned for spam.

Use advanced spam scanner—Additional antispam data will be downloaded periodically, increasing antispam capabilities producing better results.

Spam score logging—The ESET Security Ultimate Antispam engine assigns a spam score to every scanned message. The message will be recorded in the Antispam protection log (main program window > Tools > Log files > Email client antispam).

None—The score from antispam scanning will not be logged.

Reclassified and marked as spam—Select this if you want to record a spam score for messages marked as SPAM.

All—All messages will be recorded to the log with a spam score.


When you click a message in the junk email folder, you can choose Reclassify selected messages as NOT spam, and the message will be moved to the inbox. When you click a message you consider spam in the inbox, select Reclassify messages as spam and the message will be moved to the junk email folder. You can select multiple messages and act on all of them simultaneously.


Attachment handling optimization—If optimization is disabled, all attachments are scanned immediately. You may experience an email client performance slowdown.

Integrations—Enables you to integrate Mailbox protection into your Email client. See Integrations for more information.

Response—Enables you to customize handling of spam messages. See Response for more information.