Worse is the California DMV. All password reset emails going to my custom .com would be subject to multi-hour delays; the password resets were valid for only a few minutes. The only way into the account was to call the tech support phone line. I had them delete the old account and re-registered with a bland gmail email address.

I don't know of any technical reason to delay emails to minor domains. My domain has valid MX records, uses SPF, has valid DKIM TXT records, etc.

> I don't know of any technical reason to delay emails to minor domains. My domain has valid MX records, uses SPF, has valid DKIM TXT records, etc.

I still run into that with my business address; after much mucking around with client's MS admin who did various pieces of magic on their online/azure/microsoft email platform until we finally got it down to around 2m for the delay.

The upside appears to be that now all clients who are using microsoft appear to have only a 2m delay when sending email to my business domain.

Strange. I have my own .org and I've never had a problem with the California DMV's reset emails... I just had to reset mine a month or so ago to start my license renewal, and the reset email showed up almost as fast as I could switch tabs to my webmail.