Change server hostname

If you want to change server hostname, please replace old hostname in below files:

• Update Postfix config file /etc/postfix/main.cf.
• Amavisd config file /etc/amavisd/amavisd.conf or /etc/amavis/conf.d/50-user (Debian/Ubuntu).
• /etc/hosts
• /var/spool/postfix/etc/hosts

• /usr/local/bin/dovecot-quota-warning.sh, required only if you're running iRedMail-0.8.7 or earlier releases.

• Re-generate ssl cert and key with script tools/generate_ssl_keys.sh shipped in iRedMail.

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