Our friends at Zen Software posted about an issue with Malwarebytes false positives causing some DKIM issues for MDaemon. What may happen is that MDaemon may start blocking all inbound email because it’s seeing false results that a DKIM message check has failed. This is not an MDaemon problem. What’s happening is that the libdkim.dll file that MDaemon uses as part of the DKIM check is being blocked by Malwarebytes. The solution is simple. Simply exclude the MDaemon directory from real-time or scheduled antivirus checks.
SecurityPlus provides antivirus and anti-spam services for MDaemon. It scans all inbound and outbound mail traffic for spam, viruses, malware, phishing attempts, and other types of malicious activity to catch potential threats before they have had a chance to infiltrate your network. To learn more about SecurityPlus, including how to configure it & how to identify SecurityPlus activity in your MDaemon log files, check out the following recorded webinar.