Some time in 2020??? gmail started bouncing mail from bonmot.
Add:
SPF thing:
First try: IN TXT "v=spf1 ip4:5.39.78.158 ~all"
but then this tool: https://www.spfwizard.net/
says to just use: bonmot.ca. IN TXT "v=spf1 mx a -all"
and test with https://www.dmarcanalyzer.com/spf/checker/
DMARC:
Use DMARC wizard https://dmarcian.com/dmarc-record-wizard/
to create:
"v=DMARC1; p=reject; rua=mailto:dmarc@bonmot.ca; adkim=s; aspf=s;"
DKIM:
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy <-- this recipe