CMailServer User Manual & FAQs
Return If the destination email server blocked my email server's IP, what will I do?
Open "options" -> "advanced" -> "Internet mail":
"Try ISP SMTP if direct sending failed": Some Internet mail servers use IP filter function to block spam emails. It also may block the regular emails from your mail server. CMailServer uses this option to solve this problem. CMailServer sends mail to the ISP smtp server first, then ISP forwards this email to the destination email address.
"ISP SMTP server": input a popular email ISP SMTP server address.
"ISP email address": input an ISP email address.
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