1- Take Zimbra backup or VM snapshot before doing any changes
2- Enter the following command to change SMTP Banner:
# su - zimbra
$ zmlocalconfig -e postfix_smtpd_banner="yourmailserver.yourdomain.com"
3- Then if you want to change HELO/EHLO names, enter:
$ zmprov mcf zimbraMtaMyHostname yourmailserver.yourdomain.com
4- If you want to disable adding X-originating (Client‘s internal-LAN IP) to email headers:
$ zmprov mcf zimbraSmtpSendAddOriginatingIP FALSE
5- Then restart Zimbra Services:
$ zmcontrol restart
How to test whether it is working:
1- Telnet to your mail server from Windows cmd or Unix GNU telnet client
telnet yourmailserver.yourdomain.com 25
- It firewall allows you to access, doing telnet to port 25 should
get your server to greet you with 220 yourmailserver.yourdomain.com
2- In telnet, type following to get HELO response
> helo yourmailserver
You should get:
250 yourmailserver.yourdomain.com
3- In telnet, type following to get EHLO response
ehlo yourmail
You should get:
250 yourmailserver.yourdomain.com
Rest of EHLO lines according to yoru server config, such as MTA mail size, STARTLS