Putting you in the awkward position of being both an automated mail-generator, as well as remailer. That's a tough position, and there is no way to keep everyone happy. We can't use enforcing-mode DMARC at DayJob because we need deliverability far more than anti-phishing; all it really does for us is tell other mailers that subdomains should be bit-bucketed.

Waiting for IP reputation to regenerate sucks a lot.