mailx Not Sending Email

Question

I installed mailx in my Linux webserver running CentOS 7. When I try to send a test email,

echo "Body test." | mail -r "[email protected]" -s "Subject Test" [email protected]

I check my email and don't receive anything. However, if I use the mailq command, I get this:

postqueue: warning: Mail system is down -- accessing queue directly
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
7805D2DF        422 Wed Jan 11 15:00:40  [email protected]
                                         [email protected]

Solution

mailx is a client, you still need an MTA like postfix/sendmail/exim, or specify a server

$ mailx -v -s "$EMAIL_SUBJECT" \
-S smtp=smtp://smtp.ust.hk \
-S from="$FROM_EMAIL_ADDRESS($FRIENDLY_NAME)" \
$TO_EMAIL_ADDRESS

source

Another Example

(options vary but I think this is right for rhl)