I suspect it'll work fine, but I don't have a similar server to test with, so I can't be sure. But in this case it sounds like the server provides plain-then-STARTTLS service on port 993, which might confuse Mail.app. Port 993 is normally the special port used for the "imaps" service, the go-straight-into-TLS version of imap. The hostname given by your service provider (usually or ) Server Port. The second point is the only worry I have here.
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Now sadly, I have experienced that Apple's Mail App does not support STARTTLS on Port 143 and seems to only support encrypted IMAP connections over Port 993 using SSL/TLS. Outlook, Thunderbird, Mac Mail) have the option to use SSL/TLS. That means the SSL/TLS handshake is not done immediately, but only after the client has sent the STARTTLS command to the server. However, after the STARTTLS command, both client and server upgrade the unencrypted connection to an encrypted one. Outgoing Server Address: Port Number: 587. The first IMAP commands exchanged between client and server (including the STARTTLS command) are unencrypted. Smtp Settings For Outlook Mac 2011 Choose the mail account you want to setup as SMTP Outgoing Server. However, when using STARTTLS, which is usually used in combination with Port 143, the connection starts unecrypted. In layman's terms, one may say that the connection is immediately encrypted. With ordinary SSL/TLS, which is what is usually used on Port 993, the connection immediately starts with an SSL/TLS handshake.
The different between STARTTLS and ordinary SSL/TLS is the following: If you have been told to use port 993 and STARTTLS, then that would be very strange indeed. viewing this question over https in Firefox 34, the cipher suite being used is TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, meaning that the MAC algorithm being used is the built in MAC provided by the GCM AEAD encryption mode.First of all, notice that port 993 usually does not use STARTTLS. message length is 1122, removing preceding IV, offset and MAC verification, message, gets a final length of 1122.
message version is 0x0303 as its TLS 1.2. messagetype is 0x17, because as an Applicationdata message type, the correct value should be 0x17. TLS 1.2) include AEAD encryption algorithms, which you can think of as encryption with a built-in MAC, and. clientmac is extracted from keyringmaterial. Newer cipher suites used in later versions of TLS (e.g.
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HMAC is very widely used and described so I won't repeat the full description of it here, but it essentially hashes all the data in messages being sent to and from the webserver, combining the resulting hash with a key (which is negotiated during the TLS connection) into a short message authentication code that is sent alongside the message - the receiving end then repeats the process to ensure that the message has not been altered in transit. The MAC algorithms used in TLS (and the older SSL) cipher suites have historically been HMAC, with the hash function used in the HMAC specified in the cipher suite.