postfix
Postfix mail transfer agent (MTA) control program. tldr-pages
On Linux
Linux
Check the configuration
sudo postfix checkIdentifyCheck the status of the Postfix daemon
sudo postfix statusIdentifyStart Postfix
sudo postfix startIdentifyGracefully stop Postfix
sudo postfix stopIdentifyFlush the mail queue
sudo postfix flushIdentifyReload the configuration files
sudo postfix reloadIdentify