Peer’s Certificate not recognized

[Jaluman]

OS Ubuntu 16.04
Mozilla Thunderbird

Got this message while sending an email


Sending of the message failed.
Peer’s Certificate issuer is not recognized.
The configuration related to smtp.telkomsa.net must be corrected

Please help fix this


Thank you

 

[WAslayer]

You may be missing the intermediate certificate for the certificate issuer Telkom uses for their mail server certificate..

 

[Jaluman]

How to get this certificate