[nullmailer] Typo snmp -> smtp

plays/mail.yml

@@ -9,6 +9,6 @@
 - hosts: crans_server,!redisdead.adm.crans.org,!soyouz.adm.crans.org,!titanic.adm.crans.org,!boeing.adm.crans.org,!sputnik.adm.crans.org,!zamok.adm.crans.org,!mailman.adm.crans.org
   vars:
     mail_root: root@crans.org
-    mail_snmp_server: smtp.adm.crans.org
+    mail_smtp_server: smtp.adm.crans.org
     mail_defaulthost: crans.org
   roles: ["nullmailer"]

roles/nullmailer/tasks/main.yml

@@ -11,7 +11,7 @@
 
 - name: Set nullmailer remotes
   copy:
-    content: "{{ mail_snmp_server }} smtp\n"
+    content: "{{ mail_smtp_server }} smtp\n"
     dest: /etc/nullmailer/remotes
 
 - name: Set nullmailer adminaddr