# Incoming email crashes on an RFC 8601 "no result" Authentication-Results header (authserv-id; none)

**URL:** <https://meta.discourse.org/t/incoming-email-crashes-on-an-rfc-8601-no-result-authentication-results-header-authserv-id-none/413648>\
**Category:** Bug\
**Created:** [30 september 2026 om 12:20 UTC](https://meta.discourse.org/t/incoming-email-crashes-on-an-rfc-8601-no-result-authentication-results-header-authserv-id-none/413648 "2026-09-30T12:20:10Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![murphsmurf](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/murphsmurf/32/579357_2.png) [@murphsmurf](https://meta.discourse.org/u/murphsmurf)\
**Post date:** [30 september 2026 om 12:20 UTC](https://meta.discourse.org/t/incoming-email-crashes-on-an-rfc-8601-no-result-authentication-results-header-authserv-id-none/413648/1 "2026-09-30T12:20:10Z")

</div>

When `email_in_authserv_id` is set and an incoming email carries a matching Authentication-Results header with no result (`Authentication-Results: ``mx.example.com``; none`, the RFC 8601 §2.2 “no-result” form), creating the post fails with:

```plaintext
NoMethodError: undefined method 'each' for nil
lib/email/authentication_results.rb:45:in 'block in Email::AuthenticationResults#calc_dmarc'

```

The post is lost, and the sender gets no rejection email.

**Why:** in `parse_header`, the `no_result` branch of `authres_payload` matches, so `resinfo_val` is nil and `parsed_resinfo` is never assigned. The result is `{ authserv_id: "``mx.example.com``", resinfo: nil }`, and `calc_dmarc` then calls `result[:resinfo].each`.

**When it happens:** some MTAs add the no-result form when they ran no checks. rspamd does this for unauthenticated mail from its `local_addrs`, for example mail relayed from inside the network. The crash only shows when a post is created (`Email::Receiver#create_post` → `auth_res_action`). Mail that is rejected earlier, for example from a stranger, never reaches it.

**Reproduce** (rails console):

```plaintext
SiteSetting.email_in_authserv_id = "mx.example.com"
Email::AuthenticationResults.new(["mx.example.com; none"]).verdict
# => NoMethodError: undefined method 'each' for nil

```

**Suggested fix:** in `calc_dmarc`, `Array(result[:resinfo]).each do |resinfo|`, or set `parsed_resinfo = []` in `parse_header`. A no-result header then counts as gray, which matches its meaning.

Seen on ESR v2026.7.3, and the same line is still on `main`.