The incoming and outgoing mail server port number settings in Mac Mail are advanced options that tell the Mail application how to communicate with the mail servers. The correct values are 993 for the incoming (IMAP) server and 587 for the outgoing (SMTP) server. Both of these are secure (encrypted) connections and require authentication (using your Lehigh username and password). On the old legacy Lehigh mail server, there were other port numbers that were also supported (and which the MacOS automatic configuration utility for mail might have found), but these are being discontinued. For the migration to the new mail server, you must use the correct port numbers. If the port number settings are incorrect, you will see no mail folders and your Inbox will be empty (for incoming mail); and sending mail will fail.
Note: This procedure only applies to users of legacy Lehigh email. It does not apply to Lehigh Gmail, and is not relevant for students or anyone else who is already using Lehigh Gmail. It is specific to the Mac Mail email client. Other email client programs (such as Microsoft Outlook or Thunderbird) will have a similar setting, but the exact name and location of the option controlling this setting will be slightly different.
Click OK to close the SMTP Server List panel, and then close the Mail Preferences dialog window. Quit the Mail application and restart it. Be patient, as your folders may need to be re-indexed and this may take some time.
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