this post was submitted on 26 Sep 2026
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A DNS lookup on a domain says who runs the email server for email users on that domain (that's how email senders figures out how to send you messages), and if that host is a known one then you can just pull the link to show. If you're self hosting email then a few solutions can be recognized and login shown by guessing that the email software's default URL pattern is used.
I figured it was something like that, thanks for the explanation!