Sender reputation

NoSpamProxy uses a multi-level system for evaluating the sender reputation, which comprises a total of nine different checks. The most important ones include SPF, DKIM and DMARC checks, which can be used to identify beyond doubt whether an email originates from the specified sender.

  • The Sender Policy Framework (SPF) prevents the forging of the sender address of e-mails.
  • DomainKeys Identified Mail (DKIM) secures outgoing emails with an electronic signature. See DKIM keys.
  • With a DMARC entry, the sending domain can determine which quality criteria an email from it must meet. NoSpamProxy consistently evaluates this information. These methods are combined with the Level of Trust.

You make the settings for evaluating the sender reputation in the Reputation filter.

TIP:

See our series of articles on the NoSpamProxy blog for more information on sender reputation and email security:

Sender reputation and email security - Part 1: Authenticated Received Chain (ARC)

Sender reputation and email security - Part 2: Sender Policy Framework (SPF)

Sender reputation and email security - Part 3: DomainKeys Identified Mail (DKIM)

Sender reputation and email security - Part 4: Domain-based Message Authentication, Reporting and Conformance (DMARC)

Sender reputation and email security - Part 5: DNS-based Authentication of Named Entities (DANE)