Sender Header behavior updates

What has changed?

The Sender address headers setting found in Profile > Project Mapping/Rule > Email Only Users.

Summary of changes:

  • Sender address headers are tested sequentially until a valid sender address is found (passing Profille > Included/Excluded Senders checks)

  • If no Sender Headers are configured it falls back to From then Reply-To rather than just From

  • If a sender address matches both Included and Excluded Senders then it is deemed valid

  • Newly created Project Mappings and Rules will have Sender Headers set to From and Reply-To

Am I affected?

You had no Sender Headers configured in your project mappings

Previous behaviour

New behaviour

Previous behaviour

New behaviour

Falls back to use the From header to find sender

Falls back to using From then Reply-to headers to find sender

To replicate previous behaviour, set From in the Sender address headers setting.

You had Included Senders or Excluded Senders configured

Previous behaviour

New behaviour

Previous behaviour

New behaviour

If an included sender is not found in the first configured Sender Header, message is immediately handled as per Profile Exclusion Action

If an included sender address is not found, subsequent Sender Headers (if present) will be tested against Included/Excluded Senders

If an excluded sender is found in the first configured Sender Header, message is immediately handled as per Profile Exclusion Action

If an excluded sender address is found, subsequent Sender Headers (if present) will be tested against Included/Excluded Senders

To replicate previous behaviour, use a Scripting feature such as .

JavaScript snippet example of enforcing an outcome based on a single header value

The JavaScript example below is related to Exclusions and From header ( if you require Reply-To change to Reply-To). To instead check for inclusions invert the isHeaderExcluded condition check.

Script

const headerValue = message.getHeader('From').toString(); const isHeaderExcluded= headerValue.match('.*@excludeme.com'); if (isHeaderExcluded) { setOutcome('DROP','Because matches .*@excludeme.com regex'); }

Further reading