SSL security certificates are complex and often poorly implemented. In your example the email server host name in the server security certificate differs from the server's actual name. That's a big red flag and should be taken seriously.
Email Client Setup: Outlook for Mac 2011 Step by Step Walkthrough (POP) You will need your incoming mail server, outgoing mail server, full email address, and your email password. You can find these settings by logging into your Mail Central. When you use Mac Mail or Microsoft Outlook Express to send e-mail messages, the messages may not be copied to the Sent folder. This problem only occurs when you use IMAP to connect to the e-mail account.
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The right way to address the problem is to have 'Roundcube' address that discrepancy. Mnemonica tamariz pdf creator. They should either deploy their security certificates properly, or not at all.
If they are not willing to do that, then you must decide whether the certificate is trustworthy or not. Assuming you want to trust it despite its improper implementation, then just click Continue and accept the risk that Mail is connecting to the correct email server despite the host name mismatch. Mail won't ask you again.
An improperly implemented security certificate is arguably worse than no security whatsoever. Lacking a properly implemented security certificate, they're offering the illusion of security.
I wonder if anybody can give details of incoming and outgoing server settings and port selection etc?
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That's a question for your email service provider 'Roundcube', but you might find the following useful: Mail Settings Lookup - Apple Support. No one else will be able to know those details, unless they're familiar with 'Roundcube' and I'm not.
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Jul 31, 2017 8:07 AM