GFI MailEssentials

DNS-name in stead of IP (perimeter)

Some domains have backup MX-records at their ISP/IT-partner. In those cases, the SMTP-perimeter server setting is in place, but I've seen that some of the ISPs work with variable IP-ranges, ergo ME is not set correctly all the time (it does not support MX-records, but IP-addresses, and those pointers can vary in practice).

For example:

10 mail.domain.com, which is 1 IP

20 backup.isp.com, which might resolve now in 2 IP's, but tomorrow in 3, or 2 different IP's.

Not too common, but I know KPN is changing IP's really often.

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