Received the below question regarding Greylisting in an Active – Active HA environment. The answer is below as well!
Can Greylisting be used in an active/active High availability enviroment (with 2 mx records pointing to 2 fortimails)?
I mean:
When an email comes and gets greylisted by fortimail#1, if the second attempt comes to the other fortimail (fortimail#2)
what happens? It will be graylisted again?
So we have this scenarios:
Hope 1) mail comes, gets greylisted FM1 mx1 –
Hope 2) mail comes again, is cleared FM1 mx1 –
Hope 3) mail passes
Hope 1) mail comes, gets greylisted FM1 mx1 –
Hope 2) mail comes again, gets greylisted FM2 mx2 –
Hope 3) mail comes again, is cleared FM1 mx1 – or FM2 mx2
What will haped in scenario 2 ?
Will email be delivered always?
What will happen if we have 3 or 4 or more fortimails?
Hope 1) mail comes, gets greylisted FM1 mx1 –
Hope 2) mail comes again, gets greylisted FM2 mx2 –
Hope 3) mail comes again, gets greylisted FM3 mx3 –
Hope 4) mail comes again, gets greylisted FM4 mx4 –
Sender gives up????
My response is as follows:
No, it is not recommended to use grey listing in active/active deployments. Grey listing data is not shared, at this time.
Sucks, hopefully they will make it available in future versions of the FortiMail FortiOS
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