I feel with you

Posted Sep 2, 2024 13:59 UTC (Mon) by dskoll (subscriber, #1630)
In reply to: I feel with you by yeltsin
Parent article: A SpamAssassin surprise

Yes, people don't understand email. It's very annoying.

Web developers: The only thing you should do to validate an email address is (1) check that it contains an @ character, and (2) check that everything after the last @ character is a domain name that has either an A or an MX record that ultimately points to at least one routable IPv4 or IPv6 address. That's it. Nothing else.

I say last @ character because "@$foo"@example.com is theoretically a valid form of email address, though I doubt it'd actually work in many places.

I feel with you

Posted Sep 3, 2024 13:44 UTC (Tue) by brunowolff (guest, #71160) [Link]

> I say last @ character because "@$foo"@example.com is theoretically a valid form of email address, though I doubt it'd actually work in many places.

This illusrates another issue with email addresses. There are at least three different encodings for them (raw, 821 and 822). "@$foo"@example.com might be a raw address or it might be an 821 or 822 encoding of @$foo@example.com .