[DougWebb]

Most of the time when I try that, the site's form validation complains that + is not a valid character. Very annoying. I think most of the time it's due to an over-specific whitelist, and sometimes it's due to url-escaping turning + into a space. Or maybe there's a regex and someone doesn't know how to escape literal + characters.

[roblabla]

Yeah, I had that problem with some US govt website when applying for ESTA. I have since fixed the problem : My email is *@roblab.la, and I just put whatever the org's name as the username part of my email. So far it has worked basically everywhere, except on aliexpress, where they disallow aliexpress@EMAIL_DOMAIN. Probably to avoid people posing as staff >_>'.

[qw]

I tried that too 15 years ago, but had to stop after a year. It turns out many spammers send mails to random usernames

[roblabla]

So far spam hasn't been a problem (I get none). I have spamassassin set up, but it doesn't filter anything for now, just scores stuff. If it ever gets to the point where I get too much spam, I'll probably start to filter it.