![]() ![]() I would suggest that if you are receiving improved throughput from clients, you should notice the same throughput improvements against other services (in particular if you are using an IMAP client to MailEnable, or indeed even a web-browser to IIS/Web Server). (Note: there are some socket calls like gethostbyaddr that may utilize netBIOS for resolution but MailEnable does not use such calls, and even if it did, the calls would only be called every time a new socket connection occurs - not when transmitting/receiving data). There is nothing special or specific that MailEnable's server / client does with respect to tcp/ip connectivity or netBIOS encapsulation. It also holds a persistent connection for receiving backchannel updates from the server why the client is connected - for new mail and notification processing. The client allocates a pool of socket connections to the server for issuing commands to the server (to improve client responsiveness). The client connects to the server (just like an IMAP client does), by connecting to port 143 and accepting a session. The IMAP service does use IOCompletion ports for scalability - although this can be turned off, and is best practice and should not have anything to do with netBIOS. The server binds and listens for connections from IMAP and MAPI clients (just as any other windows socket service does). MailEnable's MAPI protocol operates as an extension of IMAP (typically port 143). I'd welcome comments from ME about this issue. Needless to say, I'm not happy with the security implications of having these or any other unecessary ports open on an internet-facing server and will probably block them again fairly shortly. I don't know for sure but I do wonder what other "hidden" port/protocol dependencies there may be in the MAPI services. The general stability and speed of MAPI services - as experienced by users - improved as a consequence.
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