Fix receiver type in email send
diff --git a/staffeln/common/email.py b/staffeln/common/email.py
index b1d3239..6aaaf9b 100644
--- a/staffeln/common/email.py
+++ b/staffeln/common/email.py
@@ -11,9 +11,14 @@
 

 def send(smtp_profile):

     """Email send with SMTP"""

+    dest_header = (

+        smtp_profile["dest_email"]

+        if isinstance(smtp_profile["dest_email"], str)

+        else str(smtp_profile["dest_email"])

+    )

     message = MIMEText(smtp_profile["content"], "html", "utf-8")

     message["From"] = Header(smtp_profile["src_name"], "utf-8")

-    message["To"] = Header(smtp_profile["dest_email"], "utf-8")

+    message["To"] = Header(dest_header, "utf-8")

     message["Subject"] = Header(smtp_profile["subject"], "utf-8")

     try:

         smtp_obj = smtplib.SMTP(

diff --git a/staffeln/conductor/result.py b/staffeln/conductor/result.py
index 88173ca..b107172 100644
--- a/staffeln/conductor/result.py
+++ b/staffeln/conductor/result.py
@@ -32,11 +32,11 @@
             subject = "Staffeln Backup result"

         if len(CONF.notification.receiver) != 0:

             # Found receiver in config, override report receiver.

-            receiver = ",".join(CONF.notification.receiver)

+            receiver = CONF.notification.receiver

         elif not CONF.notification.project_receiver_domain:

             try:

-                receiver = ",".join(

-                    self.backup_mgt.openstacksdk.get_project_member_emails(project_id)

+                receiver = self.backup_mgt.openstacksdk.get_project_member_emails(

+                    project_id

                 )

                 if not receiver:

                     LOG.warn(