Reply-to user email on tool error email

lib/galaxy/config/schemas/config_schema.yml

@@ -1159,6 +1159,14 @@ mapping:
           set.  Also this email is shown as a contact to user in case of Galaxy
           misconfiguration and other events user may encounter.
 
+      error_email_reply_to_user:
+        type: bool
+        required: false
+        desc: |
+          When sending email reports for tool errors, include the user's email address
+          in the Reply-to SMTP header (used by some ticketing systems to identify the
+          appropriate response address).
+
       email_from:
         type: str
         required: false

lib/galaxy/tools/errors.py

@@ -253,6 +253,7 @@ def _send_report(self, user, email=None, message=None, **kwd):
         except Exception:
             pass
 
+        reply_to = user.email if self.app.config.error_email_reply_to_user else None
         return util.send_mail(
-            self.app.config.email_from, to, subject, self.report, self.app.config, html=self.html_report
+            self.app.config.email_from, to, subject, self.report, self.app.config, html=self.html_report, reply_to=reply_to
         )

lib/galaxy/util/__init__.py

@@ -1506,7 +1506,7 @@ def size_to_bytes(size):
         raise ValueError(f"Unknown multiplier '{multiple}' in '{size}'")
 
 
-def send_mail(frm, to, subject, body, config, html=None):
+def send_mail(frm, to, subject, body, config, html=None, reply_to=None):
     """
     Sends an email.
 
@@ -1527,7 +1527,10 @@ def send_mail(frm, to, subject, body, config, html=None):
 
     :type  html: str
     :param html: Alternative HTML representation of the body content. If
-                 provided will convert the message to a MIMEMultipart. (Default 'None')
+                 provided will convert the message to a MIMEMultipart. (Default None)
+
+    :type  reply_to: str
+    :param reply_to: Reply-to address (Default None)
     """
 
     to = listify(to)
@@ -1551,6 +1554,9 @@ def send_mail(frm, to, subject, body, config, html=None):
         msg.attach(mp_text)
         msg.attach(mp_html)
 
+    if reply_to:
+        msg["Reply-To"] = reply_to
+
     smtp_ssl = asbool(getattr(config, "smtp_ssl", False))
     if smtp_ssl:
         s = smtplib.SMTP_SSL(config.smtp_server)