Greetings! Could you help me in fixing this error I'm having, please. The log registered on my hmailserver is as follows:

"DEBUG" 1300 "2022-01-13 03:33:14.234" "Creating session 69"
"TCPIP" 1300 "2022-01-13 03:33:14.234" "TCP - 2600:c05:3010:8888::29 connected to 2806:109f:1a:952b:55a0:6cf9:1655:3065:2525."
"DEBUG" 1300 "2022-01-13 03:33:14.250" "TCP connection started for session 66"
"SMTPD" 1300 66 "2022-01-13 03:33:14.250" "2600:c05:3010:8888::29" "SENT: 220 mail.aeiks.com"
"DEBUG" 1300 "2022-01-13 03:33:14.250" "The read operation failed. Bytes transferred: 0 Remote IP: 2600:c05:3010:8888::29, Session: 66, Code: 2, Message: End of file"
"DEBUG" 1300 "2022-01-13 03:33:14.250" "Ending session 66"
"DEBUG" 1300 "2022-01-13 03:33:16.875" "Creating session 70"
"TCPIP" 1300 "2022-01-13 03:33:16.875" "TCP - 2600:c05:3010:8888::29 connected to 2806:109f:1a:952b:55a0:6cf9:1655:3065:2525."
"DEBUG" 1300 "2022-01-13 03:33:16.875" "TCP connection started for session 69"
"SMTPD" 1300 69 "2022-01-13 03:33:16.875" "2600:c05:3010:8888::29" "SENT: 220 mail.aeiks.com"
"DEBUG" 1300 "2022-01-13 03:33:16.875" "The read operation failed. Bytes transferred: 0 Remote IP: 2600:c05:3010:8888::29, Session: 69, Code: 2, Message: End of file"
"DEBUG" 1300 "2022-01-13 03:33:16.875" "Ending session 69"

Your server can connect to my mail server but something is interrupting the process. Could you help to diagnose this issue please? If you can, could you sent me the logs from your side. I think that maybe is a configuration server from my server, but i need more information. Thanks in advanced. God blessed you.

P.D:My server uses public ipv6 address for comunication, because my ipv4 address is behind cgnat. Web, DNS and other services are running without issues with the ipv6 address.