Can't send email to + address

I have several different Google Alerts and I wanted to filter them easily into different labels in my Gmail. Since they all come from the same email address I decided to have them sent to different email addresses and filter them that way.

Of course one of Gmails features is being about to add '+txt' to your email and it all goes to your email address but you can identify the email it was sent to easily. Unfortunatly when I tried to add a + to my Google Alerts, I got an error.



I cannot think of a single reason why Google wouldn't be able to do this. I understand that Google Alerts is still in beta, but it seems like the address they send an alert to shouldn't be restricted by one of their own features.

Strange.