There is a LOT of broken software that will refuse rfc compliant email
addresses as they do not properly follow the standards. The + sign has
been in use and part of the rfc's for at least 30 years. I've found
that using the underscore '_' will work when the plus '+' sign does not,
however your mileage will vary.
What is even worse, you can create a <user>+tag@<domain> but later on
the same companies software in a different part of the website will then
refuse to accept the tagged address so even an initial acceptance can
have problems elsewhere.
On 8/19/2016 10:21 AM, Bill Cole wrote:
On 18 Aug 2016, at 19:36, Mark Sapiro wrote:
Altering the From: based on recipient can be done by modifying the code.
Say you have a message "From: Ann User <a...@example.com>" and you want
to change that to "From: Ann User <ann+...@example.com>" where xxx is a
unique code for each recipient.
Please, don't anyone do that, ever. It's not just "risky," as noted in
earlier discussion, it would be positively abusive.
A less obvious approach would be to add an address IN A DOMAIN YOU
CONTROL in a X-[something] header (or perhaps a Cc header) that is
unique to each recipient so that when you get mail to that address,
you've identified your problem user.
HOWEVER, there is an angle to this problem that should be understood:
it's probably not being done by a human subscriber. One possibility is
that a subscriber has malware on their machine that is generating the
spam, so when you identify a subscriber who is your vector, you may only
be identifying someone which an insecure machine. Another possibility
(which would be untraceable and easy to automate on the spammer side) is
that someone other than a subscriber is harvesting addresses and
subjects from your web archive at mail-archive.com, where every message
has a button to "Reply via email" that kicks back a redirection to a
mailto: URL with the sender's address and Subject.
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