From 641168f09dd117f053726593811bd0e35f6cc33e Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Wed, 4 Dec 2019 16:39:43 +0530
Subject: email: Handle blank Subject headers.

* email/email.scm (post-process-fields): Treat blank Subject headers
as having the null string as value.
* tests/email.scm ("blank Subject header must be treated as having the
null string as value"): New test.

Reported-by: Ricardo Wurmus <rekado@elephly.net>
---
 email/email.scm | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'email')

diff --git a/email/email.scm b/email/email.scm
index fdd8031..9478477 100644
--- a/email/email.scm
+++ b/email/email.scm
@@ -723,6 +723,9 @@ values. The returned headers is a string and body is a bytevector."
           (cons field value))
          ((field . values)
           (cons field values))
+         ;; If the Subject header is blank, treat it as having the
+         ;; null string as value.
+         ('subject '(subject . ""))
          (_ #f))
        fields))
 
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