![]() Note, that you cannot use self-signed certificates or certificates issued by an internal PKI because they are not supported. *.) issued by third-party certificate authorities like LetsEncrypt, Digicert, etc. This certificate could be a wildcard certificate (eg. TCP port 25 access from a client to your Office MX endpoint.You can still create an SMTP relay in Office 365 even without this, but you might not test. ![]()
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