

If you use either "Outlook 2019 for Mac" or the Outlook program contained in "Microsoft 365 for Mac," the error can result if you send an e-mail with an attachment while using "Norton Security for Mac" version 8.6.3 or newer.
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The Outlook program contained in "Office for Mac 2016" will run on Big Sur, but may have to be updated first (see /wdvk2de7). Outlook version 14, which was included in "Office for Mac 2011," does not work on Big Sur. Different versions of Outlook have trouble with the operating system. A conflict between Outlook and Big Sur.In your case, the Mac's software probably caused that to happen. Typically, this occurs when a computer sends the mail server an erroneous bit of code. (The mail server is called, where SMTP stands for "simple mail transfer protocol").

I get an error message that says "a secure connection cannot be established with the server ."Ī: There's some miscommunication between your Mac and the Comcast mail server. Q: Right after I upgraded my Mac to the Big Sur 11.3 operating system, I could no longer send e-mails with attachments using the Microsoft Outlook program.
