![]() ![]() GFI MailEssentials makes use of perimeter servers to identify which external server sent the email to the local email server. ![]() This process continues until the first IP address which is not part of the Perimeter servers is found. ![]() If the IP address is found in the Perimeter servers, the IP address in the next Received line is checked. When Perimeter Servers are enabled and configured in MailEssentials, the modules specified above will check the IP addresses in the Received lines. If the Perimeter SMTP Servers are not correctly entered the checks performed by the DNS dependent modules might fail including IP DNS Blocklist, Sender Policy Framework (SPF), IP Whitelist, IP Blocklist and Spamrazer. the MX Record is NOT pointing to the machine where MailEssentials is installed), one or more Perimeter SMTP Servers have to be entered in the MailEssentials configuration. If the MailEssentials server is NOT the first SMTP server that receives the email from the internet (i.e. A Perimeter SMTP Server is the first email server that receives emails from the internet. ![]()
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