XenForo Email errors I could use some assistance with. No email is being sent.

[louisl]

We are using the forums internally (intranet) running on a Windows server/ AD Domain. Unfortunately, I don't have access any servers outside of the one XenForo in running on. I can however have the infrastructure team update/or correct the issue if I know where to make the change. I'm fine with using anyone option SMTP/PHP.

Initially all worked well using SMTP, but now I get this message after upgrading to V2.3.4

Using SMTP I add the server a smtp.MYDOMAIN.com and port 25; however now I'm...

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