Hi!
We have been asked to allow the plus sign in emails addresses.
On Postfix's side I added "recipient_delimiter = +" and everything seems
to work perfectly.
The way I understood it only the server which receives the emails and
does the actual delivery to the "mailbox" has to know how to deal with
sub-addressing ("plus-addressing"), the server which sends the email
could be unable to deal with those kind of addresses as long as it is
not involved in delivering the mail to the "mailbox" there should not be
a problem, is that right?
I also have to tell the developers of our applications what should be
allowed...
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?
ie something like this
user+foo+...@example.com
Is this legit and does Postfix uses only the user part and domain part
for delivery and leaves dealing with the "+foo_bar" to the MUA?
I know the plus sign is not allowed by every website but I have been
told that is not a problem as long as our own websites accept it
Apart from the obvious problem with websites, and servers which can
allow sub-addressing ("plus-addressing") but on which it was not
activated, are there any other known issues with it? I know that an old
ms exchange server is involved in the sending of some of our emails but
as long as it is not involved in the reception of the emails there
should be no problem, right?
(Because the plus sign was always a recognized character by the RFC
(originally 822 and 2822 I believe...))
Thank you and have a nice day!
Nick
