Is it true that there are currently bugs in the ISP module regarding the automatic creation of DNS entries. Specifically MX entries. It would seem that for any given site, the *Domain Name* of the ISPConfig server (Administrative Domain) gets added as the MX. This should be corrected either by prepending the ISPConfig servers *Host Name* followed by a dot to its Domain Name, or to follow the example of the DNS manager module and set up a link to mail.site.tld. Until this is resolved, I would reccommend *ALL* DNS configuration through the DNS manager module.