SMTP " Send SMTP Mail Message: An error occurred while attempting to establish an SSL or TLS connection

Error: " Send SMTP Mail Message: An error occurred while attempting to establish an SSL or TLS connection.
The server’s SSL certificate could not be validated for the following reasons:
• The server certificate has the following errors:
• The revocation function was unable to check revocation for the certificate.
• The revocation function was unable to check revocation because the revocation server was offline."

Hi,

If you can accept to skip validation for CRL, can you try to set True at IgnoreCRL property?

Regards,

Now, I am getting this error:
Send SMTP Mail Message: 535: 5.7.3 Authentication unsuccessful [DX1P273CA0034.AREP273.PROD.OUTLOOK.COM]

Regards

HI,

First, please check if your id and password is correct.
Next, can you review settings of SMTP in O365/Outlook.com?

Regards,