[e12e]

Yes, it's very annoying.

I don't use gmail, but used to use <prefix><dash>username (prefix-username@) with qmail - and at some point had to have email at a site that used Exim with standard setup - that allowed <prefix><plus>username (prefix+user@) -- but not with a dash (it is possible to configure Exim to do this - but with qmail it is standard).

That's how I discovered that a lot of sites erroneously filter out + from the username part.

Now host my own email with Exim - but rather than use a prefix, I've just set up Exim to route all users at all subdomains to my inbox, so I can use adresses like:

[e-mail] (s for spam). So far I that have worked fine.