SSL CERTIFICATE, EXCHANGE

we are getting below error when we did test on our mx record

proofpoint gatewy:

Trying TLS on mxb-xxhosted.com[138.xx.xx.xx] (preference of 10):

Cert Hostname DOES NOT VERIFY
(see RFC-2818 section 3.1 paragraph 4 for info on wildcard ("*") matching)
So email is encrypted but the host is not verified
cert not revoked by CRL
cert not revoked by OCSP

do we need to install wild card certificate?

THIS IS ONLY happening from one external email address inbound to our exchange server through smtp gateway

all other emails are flowing in fine.

is it something to do with enforced TLS if so where should we implement?
pramod1Asked:
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Brian McDonaldIT ManagerCommented:
Sounds like on of the names on the cert if not kosher, is this a UCC cert, or just a single hostname SSL?
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pramod1Author Commented:
"Sounds like on of the names on the cert if not kosher"
what does this mean?
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