Sendmail

cat << EOF | sendmail -t 
Sender: [email protected]
From: Sender <[email protected]>
Reply-To: Sender <[email protected]>
To: To <[email protected]>
CC: Cc <[email protected]>
Disposition-Notification-To: [email protected]
Subject: Generic Subject

Generic Body
EOF

Knowledge

/usr/sbin/sendmail -Am -v -t < filename.eml
/usr/sbin/sendmail -v -t < filename.eml
/usr/sbin/sendmail -t < filename.eml

launch interpreter by magic header or env
1. Python 3.9: #!/usr/bin/env python3.9
2. Python 2.6: #!/usr/bin/env python2.6
3. TS Node   : #!/usr/bin/env ts-node
4. Python    : #!/usr/bin/env python
5. NodeJS    : #!/usr/bin/env node
6. Ruby      : #!/usr/bin/env ruby
7. Perl      : #!/usr/bin/env perl
8. PHP       : #!/usr/bin/env php
9. GO        : #!/usr/bin/env go run

nslookup
: '
Default Server:  www0.dev.shahed.biz
Address:  10.20.13.100

> set type=mx
> chorke.org
Server:  www0.dev.shahed.biz
Address:  10.20.13.100

Non-authoritative answer:
chorke.org      MX preference = 0, mail exchanger = mail.chorke.org
> exit
'

References

Why Python script start with #!/usr/bin/env python? Configuring SendMail to use username and password Configure sendmail for relaying mail over port 587 Capture debug output from Python smtplib Setup and test SMTP AUTH within Sendmail Sending mail from a Bash shell script Sending a mail from a shell script Reply-To header to send emails Sendmail Attachment Python Send Email

SMTP AUTH extension not supported by server Python access environment variables Run remote Python script via curl