Create RFC2822_DATE for use in emails. Some clients fail to sort emails properly without a Date: line.

conf/dialplan/default.xml

@@ -145,6 +145,7 @@
 	<action application="hash" data="insert/${domain_name}-spymap/${caller_id_number}/${uuid}"/>
 	<action application="hash" data="insert/${domain_name}-last_dial/${caller_id_number}/${destination_number}"/>
 	<action application="hash" data="insert/${domain_name}-last_dial/global/${uuid}"/>
+	<action application="set" data="RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)}"/>
       </condition>
     </extension>
 

conf/dialplan/public.xml

@@ -27,6 +27,7 @@
     <extension name="outside_call" continue="true">
       <condition>
 	<action application="set" data="outside_call=true"/>
+	<action application="set" data="RFC2822_DATE=${strftime(%a, %d %b %Y %T %z)}"/>
       </condition>
     </extension>
 

conf/notify-voicemail.tpl

@@ -1,4 +1,5 @@
 From: "${voicemail_caller_id_name}" <${voicemail_caller_id_number}@${voicemail_domain}>
+Date: ${RFC2822_DATE}
 To: <${voicemail_notify_email}>
 Subject: Voicemail from "${voicemail_caller_id_name}" <${voicemail_caller_id_number}> ${voicemail_message_len}
 X-Priority: ${voicemail_priority}

conf/voicemail.tpl

@@ -1,4 +1,5 @@
 From: "${voicemail_caller_id_name}" <${voicemail_caller_id_number}@${voicemail_domain}>
+Date: ${RFC2822_DATE}
 To: <${voicemail_email}>
 Subject: Voicemail from "${voicemail_caller_id_name}" <${voicemail_caller_id_number}> ${voicemail_message_len}
 X-Priority: ${voicemail_priority}