Should I switch to using Arthur.Sulzberger@nytimes.com instead?
this post was submitted on 18 May 2025
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You're partially right, I'd like to add some details: websites can also check if a domain (e.g. example.com) actually exists. So if you smash random letters on your keyboard and you end up with a non-existing domain, a website will be able to stop you from using that address.
More advanced websites also check for an MX record on the domain DNS. If a domain exists but it doesn't have an MX record, then it's not going to be able to receive emails and may be blocked in sign up forms.
Edit: not only an MX record, but also an A record, because if no MX record is present, then the mail is sent to the A record as a fallback (even though, in all honesty, I think this is a very uncommon configuration on the modern internet).
Wow thank you for the info, I didn't know they had such advanced lookups.