Steps to reproduce

• Setup a user with account email like user@example.com

• Now configure a new alias like useralias@example.com pointing to user@example.com, then edit Personal Info in WebTop's user settings setting newly useralias@example.com as new email address

• Activate the autoresponder and write a message from a secondary email account to useralias@example.com

Expected behaviour

• An automatic reply message is received

Actual behaviour

• No automatic reply message comes back

Generally, WebTop's should create Sieve autoresponder rule automatically adding the configured email address as "extra addresses" if it differs from the mail account (underlined by the default internetName).