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> I do validate that the domain not only resolves but that it also has a valid MX record because this benefits ~100% of my users and protects them from their ty
by citrin_ru 4y ago
> I do validate that the domain not only resolves but that it also has a valid MX record because this benefits ~100% of my users and protects them from their typos. It's not my problem if you want to register for my service before you set up your nameservers - its yours.
In absence of an MX record MTA will use an A record and a small but non-zero fraction of domains really has an A record pointing to a mail server.
- quags 4y agoHaving no mx record and the domain A record pointing to a mail server is valid and is a small edge case. If one were to validate mx records for an a to spam measure using this the false positive rate would be extremely low. Really anyone not having an mx record and using the A record of the root domain I’d love to hear what you are doing. I didn’t even know this was a thing until a two years ago in a career of 20 plus years.
- t09i209ba893 4y agoI did this for years with my self hosted mail server until Vimeo refused to let me register. Basically, I didn't see any reason anyone needs to know that I'm running a mail server unless they already know my address. I wondered if it might help me avoid spam. No idea whether it actually did, but I just figured it wouldn't hurt to be a little more discreet. It's not a huge deal, but I would have preferred to continue without one.