Just an FYI - Plesk has a built in sendmail backdoor through a file called FormMail.pl. It is a legit file, built to make form submissions from html to e-mail a breeze, but many of my customers have deleted the script as it, in default config, allows anyone to use it to parse spam through a server.
run this command to find it (other simple commands exist.. i know)
find / -name "FormMail*" -print
You can delete it or simply change the permissions on it so it can not be used.
For future reference, you can use the command
killall sendmail
That will kill sendmail without having to search for it.
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