4 ms·
I think the part before the @ is actually case sensitive per RFC, but most mail server will treat it case insensitive. But I am not sure I am reading the RFC co
by kuon 4y ago
I think the part before the @ is actually case sensitive per RFC, but most mail server will treat it case insensitive. But I am not sure I am reading the RFC correctly, citation:
Verbs and argument values (e.g., "TO:" or "to:" in the RCPT command
and extension name keywords) are not case sensitive, with the sole
exception in this specification of a mailbox local-part.
- a-dub 4y agorfc 822 local-parts (stuff to the left of @) are weirdly permissive. you can include quoted spaces, carriage returns and newlines (!)
- jwilk 4y agoQuoting CR and LF is no longer allowed in RFC 2822.
- jwilk 4y agoCorrection: it's still allowed, only considered obsolete. :-/
- derefr 4y agoWhich is to say, nobody of note is still allowing it; you can allow it if you like, for anyone who is still doing it; but if you don't, and someone sends you a message, and it bounces, then, well, they already know why.
- marcosdumay 4y agoYes, there are very few rules on the standard that could create two binary-different local parts that resolve to the same value (mostly involving parenthesis). But the mail server can add as many rules it wants, including the very common setting of making completely different names resolve to the same mailbox.