Email forwarders such as can forward email to another address like  These can be created like so:

Testing your forwarder

After you have set-up a forwarder, for example: to
send yourself an email to from an different account than

Sending from

Google Workspace
The easiest way is to send email from a address would be to use a dedicated email hosting service such as Google Workspace.

Creating a custom address within Gmail

Some Gmail accounts may allow to to set-up an additional custom addresses within the account.
Why is my forwarder not working?
Some email service providers (for example, will periodically filter your messages away from the inbox, or not deliver them at all.  This is usually due to overly agressive spam filtering.  For best results, forward to a Gmail account.