What is the max value for NX_MAIL_MAX_THREADS?

Document ID : KB000013311
Last Modified Date : 14/02/2018
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We are facing an issue with mail notifications sent out with delays. We have many notifications sent out in one hour.
We increased the option NX_MAIL_MAX_THREADS to the value 40 but it looks like this is not enough.
Can we increase this number higher than 40? Is there any limitation for this value?

CA Service Desk Manager 12.9CA Service Desk Manager 14.1

The option mail_max_threads is defined as "Specifies the maximum number of concurrent SMTP connections that can attempt to communicate with the server". 40 is the max value which is supported.