Mail not sending via mail server which is using a self-signed certificate

  • Here is my problem:

    I recently migrated my wordpress sites from a ten-year old Mac mini to a Raspberry Pi 3. Performance-wise, the Pi is incredibly fast and everything is working fine, except that WordPress can not send emails via my email servers. The connection can not be established.
    My email servers use self-signed certificates. On my Mac mini, I was able to accept these certificates outside of Apache and store them in the Keychain.

    I was wondering if anyone has had the same problem and if there are any suggestions how I could resolve this.

    Many thanks in advance.

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