www.exim.org

Anchor text: Security considerations

Wikipedia: Exim

Anchor text: The Exim FAQ

Wikipedia: Exim

Anchor text: Exim Configuration Parameters, "local_part_suffix"

Wikipedia: Email address

Anchor text: Exim 4.91 spec: Encrypted SMTP connections using TLS/SSL / 15. DANE

Wikipedia: Comparison of mail servers

Anchor text: the Redirect router

Wikipedia: Black hole (networking)

Wikipedia: Opportunistic TLS

Anchor text: Exim Callout verification

Wikipedia: Callback verification

Anchor text: Exim 4.91 spec: Encrypted SMTP connections using TLS/SSL / 15. DANE

Wikipedia: DNS-based Authentication of Named Entities

Anchor text: Clint Sim

Wikipedia: Data Control & Systems