Email delivery issues lately

We are running an IBM Series I v7r4m0, with Domino 12.01FP1, we host our 
own pair of external DNS servers within our DMZ network (just an aside)
Lately, when sending emails to gmail and a couple of other domains, in the 
last 2 weeks, they are getting bounce backs.

Our DNS Records include a google verification TXT record and an SPF 
record.

When the emails bounce back from gmail, and it is not all of them, its 
very random, they point to our not being "authenticated" via SPF or DKIM 
or DMARC

I did some searching on HCL and I am seeing the DKIM is now available for 
Linux/Win64 versions of Domino, however, nothing points to this happening 
for the Series I systems.

I guess my question is, have any of you experienced these types of 
bounce-backs recently?  Have you any ideas for us? 

Thanks, for any ideas!

Carol Taylor




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