[woleium]

gmail does this already with . as the delimiter

[ratg13]

You can add extra periods, but not extra text/labels

Some people get around this by using the plus sign, but how some systems treat plus signs can be unpredictable.

[woleium]

Right, my mistake, its + as a delimiter.

[hperrin]

It still all just goes to your inbox. It won't put it in a label for you, you can't control whether you get push notifications per address, and it won't autorespond with a challenge on ones meant for real people.