Before configure this guidance, please make sure you’ve configured SPF checking from this link : https://imanudin.net/2016/03/11/zimbra-tips-how-to-enable-spf-checking-for-incoming-connection/. When you’ve done, by default
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How To Improvement Sender Must Login/Enforcing a Match Between From Address and sasl username On Zimbra 8.5
Zimbra have been release new Zimbra Collaboration Suite version 8.5.0 and have some changes, especially in the Enforcing a match between
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