Mail must be manually configured to use port 143 and users may not know how to do that. Specifying the port number to 143 will remove the first attempt, but will still attempt to establish an SSL connection on that port before making another attempt for TLS.Īs few - if any? - IMAP servers support SSL on port 143, this should be enough for Mail to default to TLS over SSL. Failing that it will try the same on port 143 before falling back to attempting a standard STARTTLS negotiation for TLS on port 143. Windows will try to connect to the legacy port 993 (IMAP+SSL) and attempt to establish an SSL connection.
Mail has a strong preference for SSL over TLS. Three years later with the release of Mail for Windows 10 and Outlook Mail for Windows 10 Mobile, the built-in email client in Windows finally understands the STARTTLS command and starts using modern protocol encryption standards. Yet, when Mail for Windows 8 and Windows Phone 8 was released back in 2012, only the now deprecated SSL method was available for encrypted communications with IMAP servers. The IMAP standard defined TLS support all the way back in 1999.
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