Authenticate with your ISP using outgoing SMTP authentication

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If you are running your Zimbra server in your office then it is recommended that your Zimbra server use the ISP for the office as a relay MTA. This tells Zimbra to relay all email direct to the ISP’s email server instead of attempting to deliver the email directly to the destination mail server. But what happens if your ISP implements a rule to require authentication for all relayed email? Well, you can configure Zimbra to automatically authenticate for you.