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Sending emails from a primary domain and a synonym domain
In order to send messages from the webmail with different addresses (in the situation where the main domain has a synonym domain), you need to define multiple "signatures", one for each desired identity.
Actions to be carried out
Log in to your Webmail
Go to Mail Settings -> Signatures tab
Add a signature
Change the "sender email address" to replace it with your synonym email address
When composing your message, click on the "From" dropdown menu
Adding an identity/Signature