Unable to generate email from Thingworx 8.4.2

Hi All,

We are try to send email with Mailserver template. Facing below mentioned error.

Thingworx 8.4.2

MailExtension 3.6.0 / MailExtensions 3.5.1

.

Security Log:
Unable to send error email for logged incident: failed to connect, no password specified?
Error sending email due to [Could not connect to SMTP host: secure.emailsrvr.com, port: 465].The last server response was [null] with return code [0].The error originated on host [DESKTOP-EANFF4C].

ApplicationLog:
[message: Unable to Invoke Service SendMessage on MailServerThing : Unable to send error email for logged incident]

Thanks & Regards,

Sathishkuamr C.