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- check senderbase and rbl sites for your public vps IP. Do some reputation management if need be. This is a public IP, and youre its responsible maintainer.
- nobody likes a spooky bando... be a good neighbor and mow your lawn. Add SPF records to your DNS, add opendkim processing and opendmarc processing using milters to your email. Offer strong ecc crypto for all your SMTP traffic. Provide reverse DNS for everything.
- tighten your SPF policy when youre comfortable doing so.
- Consider creating looking glass accounts on the big 3 to periodically test the traffic. Challenge yahoos often capricious blocks. Remember, the big 3 block anyone who isnt the big 3 so be prepared to see some 421 in the logs and monitor for 500s to investigate rolling shitlisting from outlook.