We generally receive a lot of  mailer-daemon@messagingengine.com tickets due to our shipping confirmation auto-generated emails.  Since we don't have the ability to verify active email address with our current business.  I have a filter set to auto-assign these tickets to a admin for closing them.  However I was wondering if anyone has experienced problems either in the OS system or from an email host by banning these messages?   Simply adding mailer-daemon to the ban list would save a lot of time but I don't want to cause any possible errors in the system.  We are currently using OSTicket              v1.9.1 (0e29c8d)Server Software    

Apache/2.2.22 (Debian)Fastmail is our current email host.. any help would be greatly appreciated.

This would be done using fiters.Admin panel -> MAnage -> Ticket FiltersAdd new filter1. name it2. give it an order #.3. make it active.4. pick your target5. pick a target, set it to equal, enter your domain you want to block.6. tick reject ticket.Click Add filter.

Thank you for the help! I will alter the filter and just reject them rather than banning the address. 

You're very welcome.  I will leave this thread open for now, please let us know if you have any problems implementing this,

I'd block them before they reach osTicket, if your email provider offers server-based mail filtering (like Gmail does). I guess what you're calling a "ban list" would do the same thing. The only collateral damage I can think of is, if this same email account is used by any human for SENDING mail, you would not get any notification of failed or delayed outgoing emails.Jack

I think that I personally would do so also depending on the situation. :)

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