📄️ DKIM
DKIM is a mechanism with which outgoing emails are signed by the mail server. Recipients can check whether an email was actually sent from the correct server or not.
📄️ DMARC
DMARC (Domain-based Message Authentication, Reporting and Conformance) aims to improve email security. DMARC itself does not offer a protection mechanism, but the option to define a policy that specifies what should happen to emails that neither pass SPF nor DKIM checks.
📄️ Email Autodiscovery
Email Autodiscovery/Autoconfig is a service which allows the email client to discover the correct settings based on the email address. Email clients known to work with Autodiscovery/Autoconfig for IMAP/SMTP include
📄️ SPF
With the help of an SPF entry, you can store the servers authorised to send emails for your domain(s) in the DNS system. The Sender Policy Framework (SPF) is intended to prevent the falsification of sender addresses for emails.
📄️ What is greylisting?
Greylisting is a technique of eliminating spam sent by virus-infested zombie PCs. In order to differentiate the two, a temporary error is simulated. A real email server will handle this correctly and make a second attempt to deliver the email. Zombies, on the other hand, will simply discard the spam emails.