Mail Redirection

Mailsac offers two types of mail redirection or aliasing.

Alternate Addressing

One of the downsides of public disposable email is that when you give out the address, and people know it is disposable, they might know they can view your mail!

But there’s a way around that. You can still keep your inbox private.

The ‘redirect’ or ‘alternate’ Address

Underneath each email address, on the main inbox page, is a special redirect address.

The alternate email address begins with“inbox-“ and has a long string of characters after it.

Any mail sent to the alternate/redirect address will be delivered to the actual address on the page.

Redirect emails work for custom domains as well. The alternate address will always display the domain as “” – which will work – but you can also change the domain to your custom domain (or any domain that receives mail at Mailsac).

For example, if the alternate address for your email, is, you can use that one, or replace the domain with your own. It would be

Of course, Mailsac offers private inboxes, too. If you create an account, you’ll be able to see the options for getting private mail. Then you can give out your actual email address without worrying whether people know it is public.


When you send email to any mailsac hosted domain, if a + plus symbol is included in the local-part of the address, it is removed as well as anything up to the the @ symbol.

For example:

will be delivered to

The original To email address is stored in the property originalInbox and is accessible using the Message Data REST API endpoint.

Many email services including Gmail, iCloud and Fastmail support stripping the + plus symbol and everything after it in the local-part of the address (everything before the @ symbol).