On 10/14/20 3:20 PM, Nick wrote: > I also have to tell the developers of our applications what should be > allowed...
Good luck with that one. I have encountered INNUMERABLE werb sites which fervently insist that '+' is not a legal character in an email address. > Is it possible to have more than one "+" sign in the email address, what > does Postfix do when it sees that, does it stop at the first one and > considers everything that follow a sub-addres? My best understanding is that under RFC2822 and others, '+' is explicitly a legal character in the local part of an email address, and there is no stipulation as to how many times it may occur in the local part. However, it is entirely up to the receiving server how to interpret single or multiple + characters, and I do not know what happens if you try to use an address with apparently multiple sub-address parts because I've never tried it. What I would ASSUME and EXPECT is that Postfix will treat everything after the FIRST + as a sub-address and deliver mail addressed to user+foo+...@example.com to u...@example.com. -- Phil Stracchino Babylon Communications ph...@caerllewys.net p...@co.ordinate.org Landline: +1.603.293.8485 Mobile: +1.603.998.6958
