#393 Connection resets due to SSL Server configuration

[AtHome]

I am setting up a server and I am having issues with SSL.
However I am confused where is the source of it. Have I misconfigured SSL or does it need adjustments to work with that particular server?

I am getting the same error for all the services.

2021-04-30 19:24:11,816 ERROR [SmtpConnection-47140] davmail  - Connection reset
javax.net.ssl.SSLException: Connection reset
        at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:127)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:349)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:292)
        at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:287)
        at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:144)
        at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1418)
        at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1324)
        at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:440)
        at java.base/sun.security.ssl.SSLSocketImpl.ensureNegotiated(SSLSocketImpl.java:829)
        at java.base/sun.security.ssl.SSLSocketImpl$AppOutputStream.write(SSLSocketImpl.java:1199)
        at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81)
        at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142)
        at davmail.AbstractConnection.sendClient(AbstractConnection.java:186)
        at davmail.AbstractConnection.sendClient(AbstractConnection.java:166)
        at davmail.smtp.SmtpConnection.run(SmtpConnection.java:66)
        Suppressed: java.net.SocketException: Broken pipe (Write failed)
                at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
                at java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110)
                at java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:150)
                at java.base/sun.security.ssl.SSLSocketOutputRecord.encodeAlert(SSLSocketOutputRecord.java:81)
                at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:380)
                ... 13 more
Caused by: java.net.SocketException: Connection reset
        at java.base/java.net.SocketInputStream.read(SocketInputStream.java:186)
        at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
        at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:478)
        at java.base/sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:472)
        at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:160)
        at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:110)
        ... 10 more

Relevant settings

# DavMail listeners SSL configuration
davmail.ssl.keystoreType=PKCS12
davmail.ssl.keystoreFile=/usr/lib/ssl/certs/davmail2021.p12

BTW is there a debugging exchange server I could run agents? Does the outlook.com work as one?