When a user sends mail to my mail server, this error shows up in the /var/adm/messages
I have sendmail 8.12.8
Thanks in advance.
Mar 12 12:24:13 server1 sendmail: [ID 801593 mail.notice] h2CKODFx015913: ruleset=check_mail, arg1=<firstname.lastname@example.org>, relay=name.server.localhost.com[184.108.40.206], reject=553 5.1.8 <email@example.com>... Domain of sender address firstname.lastname@example.org
does not exist
Note: names and server are changed for security purpose.