Fix typo

services.mail.yml

@@ -201,7 +201,7 @@ helpdesk:
         SERVER_NAME: "helpdesk.{{ domain_public[0] }}"
         DOMAIN: "{{ domain_public[0] }}"
         SMTP_PORT: 3825
-        SMTP_HELO: "rt4.{{ domain }}"
+        SMTP_EHLO: "rt4.{{ domain }}"
         SMTP_RULES: "{% for q in helpdesk_queues | default([]) %}{% if not loop.first %};{% endif %}{{ q.name }}@helpdesk\\.{{ domain | regex_escape }}: spamc -u rt4 --log-to-stderr --pipe-to /usr/bin/rt-mailgate --url http://localhost:3881/rt --queue {{ q.name }} --action correspond;{{ q.name }}-comment@helpdesk\\.{{ domain | regex_escape }}: spamc -u rt4 --log-to-stderr --pipe-to /usr/bin/rt-mailgate --url http://localhost:3881/rt --queue {{ q.name }} --action comment{% endfor %}"
   monitoring_endpoints:
     - job_name: mariadb-helpdesk