On 2021-02-08 21:09, Dave Warren via mailop wrote:
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You could always turn on + addressing on M365...
https://docs.microsoft.com/en-us/exchange/recipients-in-exchange-online/plus-addressing-in-exchange-online
Admittedly it is fairly new, and opt-in for reasons described on the
link above, but it should be straightforward for a client moving in from
another that supported plus addressing.
The convention has existed almost as long as there's been sendmail, and
is available in postfix too. This is handy to direct incoming email
into different boxes, and makes it possible to narrow down who leaked
your email address.
Indeed: I use it for my subscription to mailop as you can see.
UNFORTUNATELY, many web sites outright refuse to accept "+" as a valid
character in an email LHS, despite the fact that the RFC's permit it.
In fact, I've run into occasions where the "new user" function permits
it, but logging in and/or password change *don't*. Worse was one that
entirely disabled it long after I've been using it successfully, routinely.
Sometimes significant ones with paid subscriptions/services. Pain in
the ass they are.
It's useful, but be aware that some sites screw it up. Some relatively
major ones.
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