fanscribed/fanscribed — comment on commit 7c67e62ff27041d2ef478aab1381bf74229d9885
File:  line 0
By L2G:

The "+" with suffix on mailbox names is also supported by other non-GMail mail servers. I don't think it's a standard, though, just a convention.

GMail also does this weird thing where it allows any number of dots (.) to be used anywhere in a mailbox name. So for example, I could be reached at larry.gilbert@gmail.com, LarryGilbert@gmail.com, l.ar.ryg.il.b.e.r..t@gmail.com, etc.