Detailed information for the notes.ini Keyword: 


Short Description: Controlls if the server will close router sessions or not (can improve performance).


The MailLeaveSessionsOpen setting in notes.ini can be used to improve router performance by avoiding constant creation and destruction of sessions. This is handy for servers that do a lot of internal mail routing. Leaving the sessions open will lower bandwidth as handshaking between servers no longer needs to happen for each session.

MailLeaveSessionsOpen=1 will leave all sessions open.
MailLeaveSessionsOpen=2 will leave all LAN based sessions open.
MailLeaveSessionsOpen=3 will not leave any session open.

The performance savings are greater when used on servers within a cluster.

IBM Recommendation:
Ensure that the MailLeaveSessionsOpen setting in NOTES.INI has a value of '1' (or at least '2').


Valid on all Domino platforms.
Valid for Domino versions 7.0 and beyond.

Related Settings:

MailLeaveSessionsOpen is a router specific setting and does not interfere with the DB server specific setting Server_Session_Timeout, or visa versa.

Default value:
When absent or set to 0, the default behavior is to leave no sessions open

MailLeaveSessionsOpen=0 / 1 / 2 / 3


UI equivalent:
There is no kown UI setting for this notes.ini variable. But you can specify this setting in the notes.ini settings tab of the configuration settings document.

Applies to:

Valid for version: