Sender Policy Framework (SPF): How it works and when you shouldn't use it
How SPF works SPF (Sender Policy Framework) is a simple method for identifying forged senders and blocking them as SPAM. The way it works is simple: The domain owner (e.g. me with the domain frankysweb.de) publishes a TXT record (SPF record) in the DNS which contains the mail servers from which I send mails. For example, if my mail server ... Read more