Named mailbox containing space are not quoted about lettre HOT 2 CLOSED

The problem comes from:

According to the RFC, an Atom can be a simple atom (everything except white space, controls and specials) or a dot-atom (an atom followed by 0 or more .atom). With the actual code, a space makes the is_valid_atom_char function return true which leads to this issue I opened, and a dot makes the function return false where it should return true when matching a dot-atom.

In my opinion, a lib like https://github.com/zesterer/chumsky would help a lot to parse such complex atoms (and to parse mailboxes in general, which would make the code more readable instead of manually parsing them). I will propose you a POC (only on this atoms section) so we can discuss about it and see.

from lettre.

In fact I was wrong, white spaces are valid around atoms, which makes the address John Smith <john.smith@localhost> totally valid. The problems comes from the parser I use (mailparse), somehow it cannot parse a mail with such an address.

from lettre.