Error messages when sending me email

My company uses an ERP called Acumatica. After months of working 100%, it’s internal email client stopped sending email a few days ago and now shows this error message when we try: “The remote certificate is invalid according to the validation procedure.” I’ve spent hours trying to determine what certificate this is referring to but am not finding anything. I do know that our SSL certificate is valid, my desktop mail client (Thunderbird) works totally fine with all of the same email accounts and Cloudflare says everything is operating normally. What do I do?

Another company ran a trace and sent us the following: "there is a problem with the external e-mail configuration for The host name contains an underscore but that is not permitted Since Cloudflare assigns this value in the url, does anyone know if it is possible to eliminate the underscore somehow?

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