[hislaziness]

I also use some email providers ability to have +xyz at the end of the username. So for a registration I would for [e-mail]. has helped me track spam and leaks in the past.

[setopt]

Same here! Both GMail and iCloud Mail support this, among others.

It works 95% of the time, but be aware that it sometimes doesn't:

- Some webpages refuse addresses with a + in it.

- I’ve had at least one instance where I lost an important email because I could register and receive emails from them, but one of their internal databases silently failed on my address. (I lost the proofs for a paper accepted in a journal, and it took some time to figure out what was going on…)

- There was at least one web page that was smart enough to just remove the +… from my address after I registered.

- Some webpages require you to be able to send emails to them from the exact address you sign up with (including the +…)

Overall I’ve been happy with the feature since it makes e-mail sorting easier, and you can just redirect a given subaddress to spam if they leak it, and it’s less effort than creating a “real” email alias per page. Just keep in mind that there are many ways it can fail, so you might not want to use it for anything that is actually important.

[gloriousternary]

Since I run my own email server, I get around some of those issues by configuring Postfix's recipient_delimiter to use . rather than +. I've never had a site treat [e-mail] as anything other than a normal email address. It certainly doesn't justify the effort I've spent dealing with deliverability issues, but it's a nice perk.

[Z7YCx5ieof4Std]

When you can't use a + use a .

[e-mail] is [e-mail] is [e-mail] is [e-mail] etc

[Numerlor]

I have a mail with catch all address so o can avoid the + so sites can never be strip it as it just randommail@domain, just have to hope nobody else figures it out and spams me at random addresses

[Rygian]

Sign the random with a hash of itself and a secret, all before the @ sign, then you can tell them apart.

[anArbitraryOne]

Why not use proxy email addresses to prevent scripts that strip everything from + to @?

[setopt]

The benefit of the + is that I don’t have to set up anything in advance. I can type an email address on any device, including devices I don’t own, and still have it work as an alias.

I do have a “real” email alias as well that I use for true spam (e.g. to get “customer club” discounts while everything they send me is autoredirected to spam by a mail filter). I reserve the + addresses for things I want in my inbox, but still want to be able to filter easily in my mail client.