root@server [/]# sendmail
sendmail: Not running with correct effective GID. Is sendmail binary setgid mailtrap?
sendmail: Not running with correct effective GID. Is sendmail binary setgid mailtrap?
root@server [/]#
Solution :
which sendmail
chown root:mailtrap /usr/sbin/sendmail
chmod 2755 /usr/sbin/sendmail
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