This will be helpful in rejectig the invalid email id’s in the server.

1. /etc/exim.conf yedeğini alın öncelikle.

2. pico /etc/exim.conf

3. Aşağıdaki satırları bulun.
accept domains = +local_domains
accept domains = +relay_domains
accept hosts = +relay_hosts
accept condition = ${perl{checkrelayhost}{$sender_host_address}}

accept domains = +local_domains
ile
accept domains = +relay_domains
arasına

endpass
message = unknown user
verify = recipient
ekleyin.
Son hali şu şekilde olmalıdır:
accept domains = +local_domains
endpass
message = unknown user
verify = recipient
accept domains = +relay_domains
accept hosts = +relay_hosts
accept condition = ${perl{checkrelayhost}{$sender_host_address}}

Confu kaydedin ve service exim restart yapın.