TLS for SMTP

How to Enable TLS for SMTP Server in Zimbra

First, become user zimbra:

# su zimbra

Set postfix’s smtpd_tls_security_level to may by:

zmprov ms  mail.server.com zimbraMtaSmtpTlsSecurityLevel may

or

zmprov modifyServer mail.server.com zimbraMtaSmtpTlsSecurityLevel may

After done, restart MTA server by:

# zmmtactl restart

Generate CSR SSL Certificate Zimbra Mail Server : SSL Certificate Multi Domain :

/opt/zimbra/bin/zmcertmgr createcsr comm -new -subject "/C=BD/ST=BD/L=Dhaka/O=PT Worldcm Network Ltd/OU=WORLDCM/CN=mail.worldcm.net" -subjectAltNames mail.worldcm.net,mail.abc.net,mail.xyz.net,www.worldm.net 

#cat /opt/zimbra/ssl/zimbra/commercial/commercial.csr