Sender Policy Framework
Principle: declare a DNS TXT (former SPF) record the hosts that are allowed to send mail from the current domain.
DomainKeys Identified Mail
Principle: ask your MTA to pass mails through a dkim service before sending them (like OpenDKIM). The DKIM signing service signs emails with a given k
Great article to configure OpenDKIM: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy
This is a policy/rule that tells the receiver MTA what to do in case of problems with the SPF records and/or DKIM signatures.
Hostname and domain name
Properly set up
/etc/hostname with the short name of the server.
/etc/hosts should contain
127.0.1.1 shortname.domain.name shortname too. (the fqdn must be first !)
hostname --fqdn should return the full fqdn.
Sending a mail: Helo command rejected: need fully-qualified hostname (in reply to RCPT TO command))
myhostname should have a fqdn instead of a short hostname in
Print queues content:
Delete a mail from a queue:
postsuper -d EMAILID