Server is CentOS 6
I installed exim4 as mta in my local server.
and I can simple send mail by mail command(
echo 'a test mail' | mail -s 'a subject' firstname.lastname@example.org
then I installed postfix, but not running.
Now the exim4 is running, and listen port 25 is exim4.
But I can't mail, with error:
postdrop: warning: unable to look up public/pickup: No such file or directory
and the blocked mail is in
I search and know to fix this error with mkfifo this file.
But I don't know, the postfix is not running, and exim4 is running, how does postfix prevent me from send mail?