[bugfix] add Date and Message-ID headers for email (#3031)

* [bugfix] add Date and Message-ID headers for email

This should make spam filters more happy, as most of them grant some
negative score for not having those headers. Also the Date is convenient
for the user receiving the mail.

* make golangci-lint happy

1 files changed, 4 insertions, 1 deletions

diff --git a/internal/email/noopsender.go b/internal/email/noopsender.go
index 20d7df2eb..bd9b1206e 100644
--- a/internal/email/noopsender.go
+++ b/internal/email/noopsender.go
@@ -31,6 +31,7 @@ import (
 // Passing a nil function is also acceptable, in which case the send functions will just return nil.
 func NewNoopSender(sendCallback func(toAddress string, message string)) (Sender, error) {
 	templateBaseDir := config.GetWebTemplateBaseDir()
+	msgIDHost := config.GetHost()
 
 	t, err := loadTemplates(templateBaseDir)
 	if err != nil {
@@ -39,12 +40,14 @@ func NewNoopSender(sendCallback func(toAddress string, message string)) (Sender,
 
 	return &noopSender{
 		sendCallback: sendCallback,
+		msgIDHost:    msgIDHost,
 		template:     t,
 	}, nil
 }
 
 type noopSender struct {
 	sendCallback func(toAddress string, message string)
+	msgIDHost    string
 	template     *template.Template
 }
 
@@ -86,7 +89,7 @@ func (s *noopSender) sendTemplate(template string, subject string, data any, toA
 		return err
 	}
 
-	msg, err := assembleMessage(subject, buf.String(), "test@example.org", toAddresses...)
+	msg, err := assembleMessage(subject, buf.String(), "test@example.org", s.msgIDHost, toAddresses...)
 	if err != nil {
 		return err
 	}