It’s possible with native messaging. You write a content script that injects some JavaScript to check the page that then messages with background page that then messages an external application. Though I likely would make it a page action or a context menu action.

I think if you’re on OS X that it would be easier to write a small automater action that you register as a service that after you select some text and right click it it parses the text and calls the shell command.

I have a catch-all inbox on my domain so there's no setup. I can just enter <whatever_i_want>@example.com and I'll get the email in the catch-all inbox.

You could create a SUID executable on your remote machine that gets addresses from an unprivileged account and creates the mailboxes, or a daemon that gets them from the network.

But I guess the easiest way would be to throw all the email into a catch-all inbox and filter it by mailbox.

Anyway, I've stopped doing that after I got locked out of a store because I couldn't remember the address I registered, and it would neither let me reset my password without I entering my email or create a new account with the same data of one that already existed. Luckily this one a shitty store so getting locked out was a gain, but the odds of this happening to something important are not low.

I used to use a different email address for placing orders, requesting info, etc. and then I'd just check that inbox when I was looking for something or just wanted to skim to look for deals, etc. However, as tends to happen with filtering, I basically just stopped looking. And I didn't really mean all of this mail to go to dev/null.

These days I tend to find that Google tabs work well enough that I don't really get overwhelmed by all the email going to the Promotions tab.

> You want your own domain. I don't know how I'd cope with the mess the internet is without an infinite supply of disposable email addresses.

I'd be surprised if there isn't a service for that.