On 07 Jan 2021, at 17:13, Wietse Venema <wie...@porcupine.org> wrote:
>> Similarly, given a email address of "p...@example.com" would it be =
>> possible to reject all emails to that address that did not contain an =
>> extension in the user name?
I should have said to "only allow emails that contain an address extension, any
address extension, not a repopulated list."
I know what I was thinking!
>> # using recipient_delimiter = +_
>> plus+plus OK
>> plus+foo OK
>> Plus_bar OK
>> plus REJECT
>
> The above works. Postfix always tries to match the complete address
> before stripping off the extension and matching the unextended name.
>
>> plus+ REJECT
>
> You don't need this, because Postfix will try the form without
> address extension, and that form is already rejected.
Those were example of possible incoming usernames used in an email, not a list
of allowed address+extension examples.
So, basically plus+<anything> or plus_<anything> is allowed, but plus@… is
rejected.
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