Gmail labels are great but they’re not universal, and are easy to strip out.
A lot of sites:
- Don’t allow +'s in email addresses
- May let your register but then not login
- Are aware of labels and simply strip them out
I have an email address I have only ever used with labels but still get spam to the non-labeled address. Spammers and email harvesters are very much aware of this trick, so it only works on legitimate sites.
Doesn’t it actually require you to sign up to an account on some app hosting platform, rather than self host it?