One of the biggest e-irritants I have is that my email address gets “sold” to companies to spam me with promotions by businesses I use (and they deny it). This trick should help identify those buggers.
The trick uses the ability tack on an alias to your gmail address using the ‘+’ character e.g firstname.lastname@example.org (where ‘alias’ that you’ll track).
So, for example, if you sign up for a service or are supplying an email an address a bank or insurance company, you can use their name e.g when you enter an email address for a bank like Nordea Denmark (is my bank and they are “selling” my email address to everybody so they can spam me too) you can supply the address ‘email@example.com’.
You’ll still receive mail from them in your ‘firstname.lastname@example.org’ inbox. All you now need to do is create a filter and Label emails to ‘email@example.com’.
If you receive email or get companies that reference email to ‘firstname.lastname@example.org’ you know who they got your email address from.
Fight the spam!