Kopi is an email forwarder.
It's all about handing out generated email addresses to websites or companies so that they don't know your real address.
Ever regretted giving out your email address? Do you keep getting emails you don't care about and didn't want in the first place?
Next time, give out a Kopi address instead. It's a targeted, disposable "burner" address. If somebody starts to abuse your trust - block that address simply and easily.
If you reply to forwarded emails through Kopi (just by replying normally like like any other mail), your real address will be kept safe from the mail sender. You can have entire email conversations with people without ever revealing your real email address.
Just tell Kopi what the new address is and all mail to your Kopi addresses will be delivered to your new email account. With Kopi, you can use services like GMail or your ISP's "free" email account without worrying about being locked in to that service forever.
See rejected mail listed in your RSS feed.
If enabled, Kopi can generate a feed of your blocked email for your RSS reader. Paste the URL into your RSS reader and you can browse through rejected mail at your leisure as part of your everyday reading flow. This is great for sites that send a lot of unimportant email mixed up with messages you sometimes want to see, if you happen to have the time.
Use it for Github, LinkedIn, StackOverflow, mailing lists, job seeking sites, etc. Any service that sends emails can be turned into an RSS feed instead.
Ensure your mail is always fully under your control.
Kopi allows you to use multiple different domains for forwarding mail - but those domains are shared with other people. If you don't want to use Kopi any more, you can't take those email addresses with you because the public mail domains are shared with all the other Kopi users.
Kopi allows you to use your own registered domain to forward mail. If you ever decide to leave, you can just change your DNS entries to point to a different Mail exchanger and have no dependency on Kopi at all.
More details about the Bring your own domain functionality is available on the wiki.
Kopi is a paid service.
You are the customer, not the product. Kopi will never have ads, does not engage in any kind of data harvesting and will never sell your information to anybody.
The first month is free so you can try it out before you buy. At the end of the trial period (you will be notified first) Kopi may stop forwarding mail on your behalf so that resources can be reclaimed for paying customers.