Jul 092009
I recently needed to do some testing with sending mail, and needed a host that would accept mails without asking questions, and just discard it. This turned out to be pretty easy with Postfix. Starting with a fresh installation on Debian Lenny, add the following to /etc/postfix/main.cf:
# accept all mail
relay_domains = static:ALL
# then get rid of it
smtpd_end_of_data_restrictions = check_client_access static:discard
And before I even got to send a test mail, someone had beat me to it:
Jul 9 03:43:58 mx02 postfix/smtpd[13940]: 6BC681740FC: discard: END-OF-MESSAGE from 114-45-59-8.dynamic.hinet.net[114.45.59.8]: <114-45-59-8.dynamic.hinet.net[114.45.59.8]>: Client host triggers DISCARD action; from=<z2007tw@yahoo.com.tw> to=<tv9977ccv@yahoo.com.tw> proto=SMTP helo=<98.129.169.123>
Yes, I probably should have firewalled out port 25…
Jun 072008
Have you ever wondered what all those SMTP status codes mean? It’s not that hard to read. Each code consists of three numbers. The format for this is class.subject.detail, for example 2.5.0 (also written as 250).
