That does not work because anybody who has your email address knows to remove anything after '+'. The only case it can work is if you were to only use addresse

That does not work because anybody who has your email address knows to remove anything after '+'. The only case it can work is if you were to only use addresses where there was a + sign, and throw all other emails to the trash. I have thought of a similar technique but this time using a period that would float between all the letters I have in my username. Any emails sent to an address without the period gets autodeleted.