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Symptom

The following error appears in Exim logs on cPanel servers: 
SSL verify error: certificate name mismatch: "/OU=Domain Control Validated/OU=EssentialSSL Wildcard/CN=*.mailchannels.net"

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Impact

None. This error does not affect email delivery. Exim logs the verification status but does not reject the connection or fail the message.

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Cause

Exim 4.86 introduced certificate name checking on outbound TLS connections by default. The verification status is now logged for all outbound TLS connections — even when it is not required. The log entry is informational only.

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Suppress the error

If you want to stop this message from appearing in your logs, disable tls_verify_cert_hostnames for the MailChannels relay host in the Exim transport configuration via the WHM Advanced Editor. For reference, see the cPanel community thread on this error.