How to prevent Out-Of-Office replies from creating Support Tickets?

[DanAtHealyTechnologies]

There are a number of email headers used to detect auto-replies as this is the same method implemented by email clients to not create a constant auto-reply between to emails with auto-reply enabled. All other commercial helpdesk systems I've used implement this as well. I don't believe this exists in WHMCS, and changing the send-from email to something different than the helpdesk email is not an acceptable solution. Can you confirm if WHMCS has the ability to prevent auto-replies from creating helpdesk tickets?

[steven99]

It does not and if you have auto-responder in the support department, you can get in to a auto responder battle.   There also no hooks that i'm aware of to filter out messages by header. 

[bear]

It actually does, somewhat, by limiting damage/ticket responses.

https://docs.whmcs.com/Support_Tab
 

Quote

Ticket Reply Email Limit

Specifies the maximum number of emails you wish to receive into your support system from an individual email address within a 15 minute period. This is useful if a client opens a ticket and has an auto-responder active on their email address; the auto-responder replies to your message, the support system sends an automated acknowledgement email, their auto-responder responds ad infinitum. By default WHMCS will prevent the 10th email being imported into the support system.