On Fri, Feb 20, 2015 at 11:45 PM, MZMcBride <z...@mzmcbride.com> wrote:
> Hi.
>
> Brion Vibber wrote:
>> I personally have a bunch of test accounts that probably have the same
>> email, and I'm sure some folks have bots and other things set up
>> similarly. Note that many email providers including Gmail allow email
>> aliases with "+" and something else after your mailbox name, such as
>> 'johndoe+testing99 at wikimedia.org'; I've used this in the past to have
>> separate accounts on one email for Apple and other providers as well.
>
> It's probably difficult to estimate, but I wonder what percentage of users
> are currently using a mail provider that supports this type of behavior.
> On the one hand, I thought Gmail/Google Apps was alone in supporting
> account+someth...@example.com functionality, but on the other hand, nearly
> everybody seems to be using Gmail/Google Apps these days.

RFC 5321 says that interpretation and validation of the local part of
an email address is left entirely to the receiving host [0] which
makes verifying which hosts support various "subaddressing" methods
[1] difficult. As mentioned in [[en:Email address]] [2] however there
are quite a few large mail services and common mail transfer agent
packages support some type of subaddressing or tagging although with
various syntax variations.


[0]: https://tools.ietf.org/html/rfc5321#section-2.3.11
[1]: https://tools.ietf.org/html/rfc5233
[2]: https://en.wikipedia.org/wiki/Email_address#Address_tags

Bryan
-- 
Bryan Davis              Wikimedia Foundation    <bd...@wikimedia.org>
[[m:User:BDavis_(WMF)]]  Sr Software Engineer            Boise, ID USA
irc: bd808                                        v:415.839.6885 x6855

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