Postfix

Show content of email queue

# mailq

Try to deliver email queue

# postqueue -f

Delete an email from email queue

# postsuper -d mailid

Configuration

File: /etc/postfix/main.cf

mydomain = domain.local
myorigin = $mydomain
inet_interfaces = localhost
relayhost = [relay.domain.local]

File: /etc/aliases

root: yourmail@domain.local

# newaliases

Test

# echo -e "Subject: Test\nContent" | sendmail -v yourmail@domain.local

# echo -e "Subject: Test\nContent" | sendmail -v root