Linux Configure Sendmail as SMTP Mail Client ( submission MTA ) last updated July 24, 2009 in Categories CentOS, Debian / Ubuntu, EMail Servers, Fedora Linux, Linux, Networking, RedHat and Friends, Sendmail, Suse, Ubuntu Linux, UNIXI‘ve central e-mail server. Other servers does not need to operate as a mail server. How do I configure Sendmail as submission-only e-mail server (mail client) under CentOS / Fedora / RHEL / Debian Linux / UNIX like operating systems?