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The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 1 (2013-01-21T18:52:00). Exception Message: Cannot send mails to mail server. (The operation has
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Mac Mail - Cannot Send Message Using the server
Cannot Send Message: This Message Could not be Sent Because Your Account Does Not Have a Preferred Outgoing Mail Server, Fix • macReports
mail.app - Cannot send message using the server stmp.atlas.cz - Ask Different
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Cannot send via SMTP on Apple Mail using Proton Bridge. Authenticate first how? Can receive fine via Apple Mail and Bridge. : r/ProtonMail
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