Install Self-Signed Certificate in Zimbra Mail Server

When we install zimbra mail server, then automatically performs zimbra generate Self-Signed Certificate for webmail clients, webmail console, smtp, pop and imap. Self-Signed Certificate valid for one year from installation zimbra mail server. If the expiry date Self-Signed Certificate is not renewed automatically zimbra mail server can not be used to send and receive e-mail because it is considered less safe by zimbra.

To check the validity period on a Self-Signed Certificate zimbra mail server, please do the following :

 mail:~ # su - zimbra
zimbra@mail:~> su
Password:
mail:/opt/zimbra # zmcertmgr viewdeployedcrt

To install the Self-Signed Certificate on the mail server zimbra is already expired, please run the step-by-step below :

Before installing the Self-Signed Certificate is new, we should first backup the Self-Signed Certificate old with the command :

 mail:~ # cp -rf /opt/zimbra/ssl /opt/zimbra/backup

The next is to generate a new Certificate Authority (zmssl.cnf, ca.key, and ca.pem) :

 mail:~ # cd /opt/zimbra/bin
mail:/opt/zimbra/bin # ./zmcertmgr createca -new

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) :

 mail:/opt/zimbra/bin # ./zmcertmgr createcrt -new -days 730

Then install deploycrt self & deploy ca :

 mail:/opt/zimbra/bin # ./zmcertmgr deploycrt self
mail:/opt/zimbra/bin # ./zmcertmgr deployca

Restart daemon zimbra mail server :

 mail:~ # su - zimbra
zimbra@mail:~> zmcontrol restart

Finally It's finished installation Self-Signed Certificate on the mail server zimbra. 

Why Use a Linux Mail Server

                       Why use a Linux mail server? Check out the some of the advantages below.

• Supports POP3, IMAP and Web mail access. These are standard services that ideally should be available in any mail system for flexible email access.
• Is extremely fast, reliable and scalable. Linux performs well and its uptime is very, very good.
• Does not require expensive hardware. Thanks to its fast and efficient services, expensive high end hardware is not necessary.
• Is very secured. The Linux operating system is very difficult to exploit. TheNational Security Agency even contributed to allow Linux to support even stronger levels of security.
• Has a powerful anti-spam filter. SpamAssassin uses a wide variety of local and network tests to identify spam signatures.
• Has an effective and regularly updated anti-virus. The open source nature of Clam Antivirus allows it to respond to new viruses even faster than commercial antivirus softwares.
• Has small to zero (as in free) software cost depending on your support needs. Depending on your support needs, you have the option of using a community supported Linux or a company supported one.
• Works with Microsoft Active Directory. You can integrate Microsoft Active Directory user accounts and distribution list into your Linux mail server to simplify administration.