 inside zimbra postfix
postfix inside the zimbra install can be told not to enfore that HELO argument be a fully qualified domain name by changing setting reject_non_fqdn_hostname in the admin console global config MTA tab.
Default zimbra config is to require FQDN in HELO. This could be a problem for some Windows clients such as Outlook Express also. But for outside clients, ie for the postfix instance facing the Internet, you probably want to enforce the FQDN requirement. |