Version 15.7.6508 (Oct 26, 2017) Changed: Greylisting now evaluates on messages with no return path based on other information in the session. Changed: Included a better message for exceptions that occur when a server cannot communicate over an unsupported SSL channel (SSL3 and TLS1.0). Fixed: ActiveSync ResolveRecipients commands throws a ...

Version 15.7.6411 (Jul 21, 2017) Fixed: Exchange Web Services could enter a deadlock state causing mail service to become unresponsive. Fixed: Let's Encrypt http-1 verification challenges are being improperly intercepted by WebDAV handler. Fixed: Pop retrieval is really slow if messages end with only a carriage return (\r). Fixed: Shared ...

Version 15.7.6390 (July 4, 2017) Fixed: A plain text message can lose line breaks when displayed in HTML or when replied to. Fixed: Attempting to retrieve an email attachment via Exchange Web Services intermittently throws an exception. Fixed: Certain spam checks could negatively impact system performance due to missing RegEx ...

Version 15.6.6347 (May 19, 2017) Efficiency: Significantly reduced the load time for large calendars from their XML file Fixed: A disabled mailing list is no longer useable if list error replies are disabled Fixed: Abnormally large e-mails no longer cause Exchange Web Services clients to crash Fixed: Accepting meeting invites marked as ...