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Purelymail is extremely flexible with where you can deliver your incoming mail.
There are two main types of routing: account routing rules, and user Sieve filters. Both can accomplish the same thing. The main difference is that an account routing rule works before the target address is a specific user; so an email sent to firstname.lastname@example.org could be routed to email@example.com, and both account routing and Sieve filters would apply to firstname.lastname@example.org.
When mail is delivered to any domain you own, account routing rules can be used to redirect it. They match a specific domain and any of:
To create an account routing rule, see the routing page in the account management portal.
A user's filters trigger when a message enters their inbox. They can be used to send the mail to a specific folder, give it a flag, reject it, or even redirect it based on logic that can inspect the message itself. You can see available filter options and configure them from webmail, under filters.
Remember that you can create a "user" just for the sole purpose of routing their address to another- we don't charge per user!
Account filters use the same Sieve language that webmail filters use internally, and apply to any mail that enters your account, like a routing rule. Currently there is no graphical editor for them, but you can edit them from the Routing rules page in the account management portal.
Rules apply recursively until the address they're directed to no longer changes. For example, if you have a routing rule that redirects "A@yourdomain.com" to "B@yourdomain.com", and a rule that redirects "B@yourdomain.com" to "C@yourdomain.com", then mail to "A@yourdomain.com" will be delivered to "C@yourdomain.com".
If rules form a loop, they will cut off after a number of redirects.
In short, follow the below steps, restarting at 1 every time the recipient changes.