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 passesHope 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 mx2What 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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