On 2021-02-09 14:47, Chris via mailop wrote:
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.
Absolutely. but in the context of the Microsoft 365 platform, it is less
than 6 months since it was implemented as a checkbox administrators
could enable. Before that it took custom aliasing or other hackery.
Indeed: I use it for my subscription to mailop as you can see.
I'm not sure how many years I have used plus addressing, but I first
blogged about my experience with a product-specific implementation in
mid-2008.
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.
I've run into both of these a couple times. Sometimes in my favour, in
one case it was the "update your profile" page that wouldn't work, I
couldn't even change my e-mail address as the existing one was
non-editable and invalid. Customer service shrugged and suggested I
create a new account, so I did by referring myself, and got both sides
of the referral bonuses and their slew of new-user bonuses.
When I was running my own hosting service, I supported - as an alternate
character (user-subaddress@domain = user+subaddress@domain) and for
users that wanted, subaddress@user.domain too, although I only deployed
the DNS records upon request.
When I exited the market professionally and was looking for somewhere to
refer customers, my discovery that FastMail supported the subdomain
addressing by default brought them a decent number of mailboxes,
eventually including my own personal address(es).
It's useful, but be aware that some sites screw it up. Some relatively
major ones.
I haven't yet found anywhere that can't cope with at least one of my
address format alternates.
Another issue is that more and more companies are restricting addresses
that contain their name. Uber doesn't (or at least didn't) allow uber@,
dave+user@ or dave-uber@, but they were fine with u-morons-ber@ so that
was good enough for me.
I've seen this a bit in the health world, our local blood laboratory
accepts my email address and sends account related information, but not
appointment confirmations. I was able to discuss it with their technical
staff and the addresses was blacklisted in their ESP's database, but
they couldn't see why. I experimented with other addresses at the same
domain, and the same username at another domain, it was definitely the
username portion.
Tossing a -morons- in the middle does the trick, but it means I have
even more address formats to potentially use when trying to recall
credentials or account details. Thank dog for password managers and
searchable indefinite email retention being things.
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