OpenBSD // simple forward [ relay ] all local mails to [ via ] external smtp server
Use the already installed smtpd. /etc/mail/smtpd.conf: accept for local alias accept from local for any relay via smtp.mydomain.org
Tag: smtp
SMTP | ask a server he is serving a domain
echo “VRFY $DOMAIN\nquit” | nc SMTP.MYSERVER.TLD 25
Postfix | TLS | testing
openssl s_client -starttls smtp -connect 1.1.1.1:25
USE GMAIL WITH YOUR OWN REPLY-TO
You can tweak your gmail account to add a customized REPLY-TO on every mail you send via this account: Open your gmail account settings. Select Accounts and Import Go to Send as Click Add another address Type in your name and the reply-to address you wish to use and select Use as alias Press Next […]
Scripting SMTP with netcat
(echo EHLO $USER@$HOSTNAME sleep 1 echo MAIL FROM: $USER@$HOSTNAME sleep 1 echo RCPT TO: $EMAIL_TO sleep 1 echo “DATA From: $USER@HOSTNAME To: $EMAIL_TO Subject: $EMAIL_SUBJECT $EMAIL_DATA” sleep1 echo ‘.’ sleep 1 echo QUIT) | netcat mailserver.somewhere.org 25
bytes and bones 