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Issue Sending mail from a docker container within Plesk

ScottAMains

New Pleskian
Hi folks. I'm in the process of sorting out my installation of invoiceninja in a dockerised container on a local VM running plesk.

I have spoken to the guys over at IN and they have helped in ways they can to the extent of their scope.

I'm trying to push emails from invoiceninja through to send on my mail server and hitting a roadblock of

*stream_socket_enable_crypto(): SSL operation failed with code 1. Open SSL Error message error:1416F086:SSL routine:tls_process_server_certificate:certificate verify failed

Is this an issue with Plesk and SSL, a DNS issue or something else that I am overlooking? I'm not very versed in sysadmin stuff but I am trying to learn as I go along. I appreciate your help in advance.

I've attached a link below as well to the chat with IN so hopefully that shows some extra context if needed Email not sending V5 selfhosted in Plesk

Domain is fully secured with wildcard, webmail, mail and TLS versions.

looking further into the mail log files I can see where it's trying to connect and the errors it's presenting.

Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: connect from unknown[192.168.96.3] Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: warning: TLS SNI from unknown[192.168.96.3] is invalid: 10.0.4.11 Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: SSL_accept error from unknown[192.168.96.3]: -1 Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: warning: TLS library problem: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca:../ssl/record/rec_layer_s3.c:1543:> Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: lost connection after STARTTLS from unknown[192.168.96.3] Jul 7 17:41:51 frosty-proskuriakova postfix/smtpd[1303655]: disconnect from unknown[192.168.96.3] ehlo=1 starttls=0/1 commands=1/2

how do I resolve this issue where I can push emails through from a docker container without running into this?
 
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