dashboard: fix In-Reply-To for send_email

For some reason, the default ReplyTo field is converted to a Reply-To
header that's not well understood by the mailing lists.

Set an In-Reply-To header explicitly.

1 files changed, 6 insertions, 1 deletions

diff --git a/dashboard/app/api.go b/dashboard/app/api.go
index cd1a51db7..4a9b03171 100644
--- a/dashboard/app/api.go
+++ b/dashboard/app/api.go
@@ -14,6 +14,7 @@ import (
 	"io"
 	"math/rand"
 	"net/http"
+	"net/mail"
 	"net/url"
 	"reflect"
 	"regexp"
@@ -1936,9 +1937,13 @@ func apiSendEmail(c context.Context, payload io.Reader) (interface{}, error) {
 	if err := json.NewDecoder(payload).Decode(req); err != nil {
 		return nil, fmt.Errorf("failed to unmarshal request: %w", err)
 	}
+	var headers mail.Header
+	if req.InReplyTo != "" {
+		headers = mail.Header{"In-Reply-To": []string{req.InReplyTo}}
+	}
 	return nil, sendEmail(c, &aemail.Message{
 		Sender:  req.Sender,
-		ReplyTo: req.InReplyTo,
+		Headers: headers,
 		To:      req.To,
 		Cc:      req.Cc,
 		Subject: req.Subject,