The replies about how people "should" notice the funky URL are distressing. Why should they?
If you expect people to become experts on esoteric naming conventions in order to use technology safely and securely, you're the problem, not them.
@wollman @Oobleck ticket came in to setup marketing.domain dkim/spf/dmarc records.
And two other groups are putting in records for different spam cannons on the top domain. At least marketing knows to get a subdomain setup. Just a few days left for https://dmarcian.com/yahoo-and-google-dmarc-required/
@Oobleck I use the free version of them for my personal domain.
Work kicked off with https://sendgrid.com/en-us/blog/gmail-yahoo-sender-requirements for my group.