Test if local SMTP server is running

To test if a local SMTP server is running, you can try to ping the port 25

$ echo -e “quit” | nc localhost 25

220 ubuntu ESMTP Postfix (Ubuntu)
221 2.0.0 Bye
If no SMTP server is listening

$ echo -e “quit” | nc localhost 25

localhost.localdomain [127.0.0.1] 25 (?) : Connection refused

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