Create Certificate for zimbra Single Address.

1.  Use command
 [code=text]cd /opt/zimbra/bin[/code]

2. The next is to generate a new Certificate Authority (zmssl.cnf, ca.key, and ca.pem) :
[code=text]./zmcertmgr createca -new[/code] 
 Then we request the validity period of the Self-Signed Certificate for zimbra mail server, for example for 1 year (365 days) or 2 years (730 days) :
[code=text]./zmcertmgr createcrt -new -days 730[/code]

3.Then install deploycrt self & deploy ca :
     [code=text]./zmcertmgr deploycrt self[/code]
     [code=text]./zmcertmgr deployca[/code]

4. Restart daemon zimbra mail server :
     [code=text] su - zimbra[/code]
     [code=text]zmcontrol restart[/code]


5. Copy /opt/zimbra/ssl/ca/ca.pem to a local drive in your outlook computer. Rename that file in your local computer to ca.cer and install it. Or install past  MMC https://community.zimbra.com/collaboration/f/1886/t/1133962
Install past mmc

Or use this other method.

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