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-rw-r--r--email/email.scm3
1 files changed, 3 insertions, 0 deletions
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))