Unfortunately the server doc and the server's configuration doc would need to be researched to check for 'em. I'm unsure they're in the same place on the form as when I remember them.

In Configuration > Servers > Configurations, I would check the configuration document for the domain if this is happening on every server in the Domino domain and in any specific configuration that may have been created for the server.  The global one will be shown as * - [AllServers]. Click on the tab titled NOTES.INI Settings. You will probably find CalConn, pop3, imap, etc. as ServerTasks=.  Click Edit Server Configuration. Click on Set/Modify Parameters. Locate the parameter to be removed or modified.  If it is to be removed, then click on Clear. Select Clear parameter, and then on OK.