Open your server using SSH client such as Remmina, Bitvise SSH Client. You need to be a root user or sudo user. Consult server provider for this. Then just copy paste this when you see console:
suppose if this file is not exist then what to do with this file?
Post screenshot of the result you got from running said command
ok wait.let me try
See if your issue is resolved
wait, let me see
mail is coming but not sending to other mail
So issue is partly solved ? Are we making any progress ?
yes … off course we are making progress…thanks for you help and support
Show me the results of //email/testTo: testing an email address of same domain
yes partially solved
now what to do with the sending side?
You cannot send emails. Use snappymail admin - Go to https://SERVER_URL/snappymail/?admin If you dont know your password follow this guide SnappyMail admin password reset - #2 by seanfitz09
Then post screenshot of https://SERVER_URL/snappymail/?admin#/domains testing
i am already using snappyemail
Ok seems your ports are open and everything works except the mailserver ssl is seflsigned. Can you issue a new mailserver ssl using cyberpanel https://SERVER_URL:8090/manageSSL/sslForMailServer
ok wait
let me do this
are you there