Note: domainname —> replace with you domain namesudo apt remove postfix && apt purge postfixsudo apt install sendmailcd /etc/mailmkdir -m 700 -p /etc/mail/authinfonano /etc/mail/authinfo/authinfoadd line in that fileAuthInfo: “U:root@domainname.com” “I:root@domainname.com” …
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