Settings > Advanced > Mail processing

Performance and Resource usage

Here you can configure the processors used for email processing.

Number of idle message processors	Specifies how many processors remain active if no emails are currently received in order to react spontaneously to incoming emails.
Maximum number of message processors	Specifies the maximum number of processors that can be active. If the number is greater than the number of idle processors, they are started if necessary and are terminated again after successful email processing.
Maximum parallel processing per processor	Specifies the maximum number of emails a single processor can process simultaneously.
Maximum processor virtual memory usage	Specifies the maximum amount of memory a processor can use. If a processor exceeds this value, it is terminated.
Maximum processor life span in hours	Specifies the maximum number of hours a processor can run before it is terminated.
Mail processing timeout	Specifies the maximum amount of time allotted for mail processing.
Reject mail on timeout	When enabled a mail processing timeout that occurs during receive processing will cause the mail to be rejected.

Encrypted / Signed mail handling

Changes to a signed or encrypted email can damage its signature or content. Here you can have changes to these emails discarded.

Exchange mail handling

This excludes Exchange health probe messages from the rule, spam, and virus processing.

Mail processor statistics

Here you can see an overview of how many processors are currently active, how many emails they are currently processing, how many emails they have already processed, how much memory they are currently using and when they were created.