From Qmail Info Wiki

Apple's OS X includes a very good mail program called, simply enough, "Mail" (or "Mail.app", the actual name of the file.) The only thing it won't do is STARTTLS, however if you set up an SSL-SMTP server, Mail.app will work just fine.

Table of contents

1 Receiving Mail 1.1 IMAP-SSL 1.2 POP3-SSL 2 Sending Mail (SMTP-SSL)

Receiving Mail

IMAP-SSL

Of course, the server should be running an IMAP-SSL server. This normally listens on TCP port 993.

• On the Mail menu, choose Preferences.
• Choose the Accounts button along the top of the window.
• Click the + at the lower left to add a new account.
• General Information
  • For Account Type choose IMAP
  • For Account Description use whatever you like. This becomes a label to identify the account.
  • For Full Name enter whatever you like (usually your name, i.e. "John Simpson".)
  • For Email Address enter the email address whose mail you are checking.
  • Click the Continue button.
• Incoming Mail Server
  • For Incoming Mail Server, enter the IMAP server name. This should be the same as the CN element of the server's SSL certificate.
  • For User Name, enter the full email address.
  • The Password should be self-explanatory.
  • Click the Continue button. The program will try to connect to the IMAP server, first on port 143 and then on port 993. If it can't connect to either service, it will complain- just hit hit Continue again.
• Incoming Mail Security
  • Turn on the Use Secure Sockets Layer (SSL) checkbox
  • Set Authentication to Password.
  • Click the Continue button.
• Outgoing Mail Server
  • Outgoing Mail Server: This may already have a mail server listed, depending on whether or not this is the first account you have set up. If so, and you are using the same server as another account, just choose that "server:userid" and click Continue. Otherwise, enter the server name (which again should match the CN attribute of the server's SSL certificate.)
  • Use Authentication should be checked.
  • User Name should be the same full email address you set up for the IMAP server.
  • Password should be self-explanatory.
  • Click the Continue button. This will try to connect to your SMTP server, first on port 25 and then on port 587. If it can't connect to either service, it will complain- just hit Continue again.
• Outgoing Mail Security
  • Turn on the Use Secure Sockets Layer (SSL) checkbox.
  • Set Authentication to Password.
  • Click the Continue button.
• Account Summary
  • The program shows a summary of the information you have entered.
  • Click the Continue button.

POP3-SSL

Of course, the server should be running a POP3-SSL server. This normally listens on TCP port 995.

• On the Mail menu, choose Preferences.
• Choose the Accounts button along the top of the window.
• Click the + at the lower left to add a new account.
• General Information
  • For Account Type choose POP
  • For Account Description use whatever you like. This becomes a label to identify the account.
  • For Full Name enter whatever you like (usually your name, i.e. "John Simpson".)
  • For Email Address enter the email address whose mail you are checking.
  • Click the Continue button.
• Incoming Mail Server
  • For Incoming Mail Server, enter the POP3 server name. This should be the same as the CN element of the server's SSL certificate.
  • For User Name, enter the full email address.
  • The Password should be self-explanatory.
  • Click the Continue button. The program will try to connect to the POP3 server, first on port 110 and then on port 995. If it can't connect to either service, it will complain- just hit hit Continue again.
• Incoming Mail Security
  • Turn on the Use Secure Sockets Layer (SSL) checkbox
  • Set Authentication to Password.
  • Click the Continue button.
• Outgoing Mail Server
  • Outgoing Mail Server: This may already have a mail server listed, depending on whether or not this is the first account you have set up. If so, and you are using the same server as another account, just choose that "server:userid" and click Continue. Otherwise, enter the server name (which again should match the CN attribute of the server's SSL certificate.)
  • Use Authentication should be checked.
  • User Name should be the same full email address you set up for the POP3 server.
  • Password should be self-explanatory.
  • Click the Continue button. This will try to connect to your SMTP server, first on port 25 and then on port 587. If it can't connect to either service, it will complain- just hit Continue again.
• Outgoing Mail Security
  • Turn on the Use Secure Sockets Layer (SSL) checkbox.
  • Set Authentication to Password.
  • Click the Continue button.
• Account Summary
  • The program shows a summary of the information you have entered.
  • Click the Continue button.

Sending Mail (SMTP-SSL)

• On the Mail menu, choose Preferences.
• Choose the Accounts button along the top of the window.
• Select the account from the list on the left.
• On the Account Information tab, at the bottom of the screen you will see a drop-down list called Outgoing Mail Server (SMTP). Clicking this list will show you a list of the SMTP servers that the program already knows about, usually from being defined as part of another account. If you have already set up some other account with the same information, you can choose it from the list and you're done. Otherwise, choose Add Server....
  • For Outgoing Mail Server enter the name of the server (again, it should match the CN attribute within the SSL certificate.)
  • Turn on the Use Secure Sockets Layer (SSL) checkbox.
  • You should see the Server port change to 465 automatically. If this does not happen, enter 465 as the port number.
  • For Authentication, choose Password
  • For User Name, enter the full email address for this account.
  • The Password field should be self-explanatory.
  • Press the OK button.