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For example, this is a situation encountered when deploying a production environment for customers. I checked the information myself and called Microsoft for pre-sales consultation. Without saying much nonsense, the POP3 settings on the solution server are as follows:

Wildcard certificates cannot assign POP services by default

You need to set the certificate for POP3/IMAP through the command:

Set-popsettings-x509CertificateName mail.contoso.com

Set the access address of POP3/IMAP internal and public network

Set-PopSettings-ExternalConnectionSettings "mail.contoso.com:995:SSL", "mail.contoso.com:110:TLS"

Set-PopSettings-InternalConnectionSettings "mail.contoso.com:995:SSL", "mail.contoso.com:110:TLS"

When a client connects to the exchange server through POP3 encryption (POP3 port 995, SMTP port 587), the following certificate error may occur:

Check the receive connector client frontend connector. After changing FQDN to mail.contoso.com, the POP3 login certificate error disappears.

If a mail gateway exists in the environment, add a receive connector and cancel the original Default Frontend connector anonymously as follows:

If you cannot connect to the exchange server through POP3 995 SMTP port 25, you need to make the following modifications to default frontend connector:

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