Try to use other mail server.

strato-production.yaml

@@ -59,9 +59,9 @@
 
         - name: Send Email
           community.general.mail:
-            host: smtp.vodafonemail.de
+            host: mail.steinle-computer.de
             port: 465
-            username: christiansteinle@arcor.de
+            username: kontakt@steinle-computer.de
             password: "{{ mail_password }}"
             to: "{{ item.value.email }}"
             subject: Datenbank Backup

vars/strato-production.yaml

@@ -5,11 +5,11 @@ mysql_databases: ['buehler', 'scheidle', 'roundcube', 'svj']
 local_backup: /home/semaphore/backup
 mail_password: !vault |
   $ANSIBLE_VAULT;1.1;AES256
-  61393862616339373134316535306665363535653031656531376130353634613537376131626536
-  3033323466386366613136383164653730343634636139630a663766663163333038373132343331
-  66653564653030386237376338626337383534376665373239326563343765376534313763326439
-  3231663238353537630a386464613236373039313530616436393663376163663536373734663133
-  3838
+  61643461323362653230613639343261623939393031333835613234373037386439613431303833
+  3233393366333038653033613036656266646539613666370a353964333739636233666532616531
+  32303537393035386466366261353061646563666565353462393864653338383661333639336665
+  3837663733396433360a303736363366653161313062393434623265653464643930623732356561
+  6463
 buehler-password: !vault |
   $ANSIBLE_VAULT;1.1;AES256
   37306230376433313631326230313739396238666239323362366164363831643664306535346464