[jdm2212]

That's a bummer. FWIW there are a fair number of non-gmail domains that are gmail-backed (e.g. a lot of universities' email systems) so it should still work with those consistently I hope.

[rypskar]

It don't need to be gmail-backed for + to work. I use it on my own domain without any problems and there is no gmail involved

[__david__]

On my domain I made _ and . Also work the same as +, for annoying sites that somehow think + is an invalid character for email addresses.