How to win friends

[James Knott]

phiscock-g851W1bGYuGnS0EtXVNi6w at public.gmane.org wrote:
>> A lot don't take + in email address usernames.  + is perfectly legal
>> according to the RFC.
>>
>> + has an interesting effect, at least with sendmail.  For delivering,
>> sendmail ignores but preserves everything after the +.  You can use
>> this create variants of your email address and use them to track down
>> who passed your email address around.  So, for example, you could tell
>> Future that your email address is peter+future-hcDgGtZH8xPowKkBSvOlow at public.gmane.org  Mail to
>> that address would be delivered to peter-hcDgGtZH8xPowKkBSvOlow at public.gmane.org  But you would
>> know that any mail to peter+future-hcDgGtZH8xNBDgjK7y7TUQ at public.gmane.org came because Future
>> gave out your address.
>> --
>>      
> Very interesting. I might use that...
>
> P.
>
>    
I just tried it and it didn't work.  I received a delivery failure 
notice due to no user.

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