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SpamExperts Exim Fork

This is a fork of the Exim repository, used by N-able for SpamExperts and Mail Assure products. We have a few patches (almost always with corresponding pull requests upstream) to fix issues or add functionality that we need.

Maintainers

  • Dreas van Donselaar
  • Mikhael Anisimov
  • Alexandru Chirila

This documents the patches applied on the upstream exim-4_89 branch:

1. XCLIENT support

  • Applied here
  • Based on this patch
  • Add support for XCLIENT
  • Adds a new main option xclient_allow_hosts, only exposing the XCLIENT ESTMP extension to the specified hosts in the list.
  • Internal ticket #19841

2. Extend auth ACLs

  • Applied here
  • Run ACL acl_smtp_auth AFTER the AUTH is completed instead of before
  • Add new ACL acl_smtp_auth_accept runs on AUTH success
  • Add new ACL acl_smtp_auth_fail runs on AUTH failure
  • Copy the set_id in $smtp_command_argument and make that information available in the auth ACLs. This contains the user information.
  • Internal ticket #16054

3. Add events for temporary failures

  • Applied here
  • Add new event msg:defer:delivery for temporary delivery error
  • Add new event msg:defer:delivery:frozen for temporary delivery error, resulting in the message being frozen
  • Add new event msg:fail:delivery:expired for permanent delivery error, resulting in the message being removed from the queue.
  • Add new event msg:fail:delivery:bounced for permanent delivery error, resulting in the message being removed from the queue and bounced.
  • Internal ticket #21627

4. Destination response in callout checks

  • Applied here
  • Exposes the destination response for callout checks.
  • Adds a new variable $recipient_verify_message, containing the upstream response for SMTP callout verifications on the recipient.
  • Adds a new variable $recipient_verify_cache, set to True if the callout check was based on on the cache, False otherwise.
  • Adds a new variable $sender_verify_message, containing the upstream response for SMTP callout verifications on the sender.
  • Adds a new variable $sender_verify_cache, set to True if the callout check was based on on the cache, False otherwise.
  • Internal ticket #11866, #16480

5. Synthesized SPF in DMARC check

  • Applied here
  • Resolve not using synthesized SPF sender domain in DMARC.
  • Exim bug
  • Internal ticket #30818
  • (Patch sent to upstream)

6. Diagnostic-Code to the unroutable addresses

  • Applied here
  • Add Diagnostic code for unroutable addresses.
  • Exim bug
  • Internal ticket #30350
  • (Rejected from upstream)

7. Not-QUIT ACL connection lost after dot

  • Applied here
  • Change connection-lost to connection-lost-after-dot.
  • Internal ticket #6423

8. Expansion of local parts larger than 256 characters

  • Applied here
  • Logs failing to expand local parts larger than 256 characters to mainlog instead of panic log.
  • Internal ticket #8057

9. Extend header add buffer size

  • Applied here
  • Increase HEADER_ADD_BUFFER_SIZE value from 8192 * 4 to 8192 * 10
  • Internal ticket #8958

10. Installing exim as exim4

  • Applied here
  • Based on this Debian patch
  • Accommodates source for installing exim as exim4.

11. Disable version in binary

  • Applied here
  • Based on this Debian patch
  • Exim's installation scripts install the binary as exim- - disable this feature.

12. Fix handling temporary rejection at callout

  • Correctly handles 4XX rejections when doing the random callout check.
  • Exim bug - Reject from upstream.
  • Applied here
  • Internal ticket #32589

13. Fix handling of catchall callouts

  • Correctly handles non cached 2XX acceptance for random callout check
  • Exim bug
  • Applied here
  • Internal ticket #32828

14. Fix use of SIZE in callouts

  • Do not permit SIZE in callouts.
  • Exim bug
  • Applied here
  • Internal ticket #32870

15. Fix segfault in print_dsn_diagnostic_code

  • Add extra condition to prevent exim segfaults in print_dsn_diagnostic_code
  • Exim bug
  • Applied here
  • Internal ticket #36071