Tell us about the & quot; + & quot; in email?

Asked by holly anderson

One client claims that this is a normal box:

word+login@domain.tld

I, of course, understand that it is somewhere out there in the RFC, but for the first time I meet it. In few places, such a format is generally skipped, including on my sites ...
P.S. It seems, on Habré wrote about this, but could not find anything: (

Answers

randoll
+ and everything farther from him before @ is simply ignored. This is very convenient because it allows you to have an innumerable number of addresses in one box.

For example, I often use this feature when I register on some sites, for example, for facebook e-mail myemail+fb@domain.net, for yandex - myemail+ya@domain.net, for some dubious site - myemail + hrenkakayato @ domain.net, etc.

Emails to all of these addresses will be delivered to myemail@domain.net

And if then, for example, spam addressed to myemail + hrenkakayato starts to come to my box, then it is immediately obvious where the leak is. And it's easy to make a filter just to ban such letters ...
Replies:
Honestly, the usefulness of this is very dubious ... even if spammers get such addresses from somewhere, what prevents them from removing unnecessary tags in the address and sending them directly? I in such cases do aliases (I have mail in my domain), so it’s safer. But, as a whole, the idea is clear :) - matthew clarke
+ and everything farther from it to @ is simply ignored. Is this a standard, or does your particular mail server just do it? - sara beauregard
+ and everything that comes next to @ is simply ignored. Is this a standard or does your particular mail server just do it? - kurtis
This is the standard. But it is not included on all mailers. Big players like yahoo, gmail, yandex and so on usually have this feature (the bourgeois is called plus-addressing) enabled. If your mailbox at a small mail provider - it is better to check first. - elsia
lisa s
Plus, I can only say that the email sent to ivan.ivanov+spam@gmail.com will fall into the box ivan.ivanov@gmail.com by Google mail.
The same applies to the points, gmail cuts them. There is no difference between the boxes ivanpetrov@gmail.com, ivan.petrov@gmail.com and iva.n.pe.tr.ov@gmail.com;)
Replies:
is as customized. something like this: wiki.dovecot.org/LDA/Postfix below "Virtual users"
 This example ignores address extensions (ie user+extension@domain.com delivers just like user@domain.com):

dovecot unix - n n - - pipe
 flags = DRhu user = vmail: vmail argv = / usr / lib / dovecot / deliver -f $ {sender} -d $ {user} @ $ {nexthop} - liz rahilly
becki hinson
I have been using this chip for a long time. Very convenient to configure filters in gmail.
For example, I myself send a letter to myemail+notes@gmail.com and it is archived under the label "Notes".
sasha
This is an optional name extension that is used to conveniently filter and sort by IMAP folders on the recipient side. This is not supported by all mail servers. For example, GMail supports, but there are no emails on MS Exchange.
Replies:
Keeeep…
More likely, so: link. - adrienne gagnon
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