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Sending with a different e-mail address
For certain purposes it is possible to send e-mails with a different e-mail address.
In order to be able to send from the Zimbra Webclient with another address, the delegation right "Send as" must first be granted by the desired address.
To do this, go to Settings -> Accounts -> Delegates with the desired e-mail address in the web client (see screenshot).

Please follow the steps below if you want to configure Zimbra webclient and have more than one email address.
In case you have an X.509 certificate for signing e-mails, please ensure that you use it only for the intended address. With the wrong address, a signed e-mail is seen as invalid by the recipient.