Created
March 9, 2023 19:37
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Using expect to drive netcat - Simply piping the required sequence of commands into netcat is unlikely to work because the SMTP commands and responses would not be properly interleaved. If you want to use the method above from a script then you will need to make use of a program such as expect. Here is an example:
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#!/usr/bin/expect | |
set timeout 30 | |
proc abort {} { exit 2 } | |
spawn nc -C mail.example.org 25 | |
expect default abort "220 " | |
send "HELO example.com\r" | |
expect default abort "\n250 " | |
send "MAIL FROM:bar@example.org\r" | |
expect default abort "\n250 " | |
send "RCPT TO:foo@example.org\r" | |
expect default abort "\n250 " | |
send "DATA\r" | |
expect default abort "\n354 " | |
send "From: bar@example.org\r" | |
send "To: foo@example.com\r" | |
send "Subject: Test\r" | |
send "Date: Thu, 20 Dec 2012 12:00:00 +0000\r" | |
send "\r" | |
send "Testing\r" | |
send ".\r" | |
expect default abort "\n250 " | |
send "QUIT\r" |
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