diff --git a/htdocs/emailcollector/class/emailcollector.class.php b/htdocs/emailcollector/class/emailcollector.class.php
index 9f1d921691c..39686c6e82f 100644
--- a/htdocs/emailcollector/class/emailcollector.class.php
+++ b/htdocs/emailcollector/class/emailcollector.class.php
@@ -1436,8 +1436,13 @@ class EmailCollector extends CommonObject
 
 					foreach ($arrayofreferences as $reference) {
 						//print "Process mail ".$iforemailloop." email_msgid ".$msgid.", date ".dol_print_date($date, 'dayhour').", subject ".$subject.", reference ".dol_escape_htmltag($reference)."<br>\n";
-						if (preg_match('/dolibarr-([a-z]+)([0-9]+)@'.preg_quote($host, '/').'/', $reference, $reg)) {
-							// This is a Dolibarr reference
+						$resultsearchtrackid = preg_match('/dolibarr-([a-z]+)([0-9]+)@'.preg_quote($host, '/').'/', $reference, $reg);
+						if (empty($resultsearchtrackid) && getDolGlobalString('EMAIL_ALTERNATIVE_HOST_SIGNATURE')) {
+							$resultsearchtrackid = preg_match('/dolibarr-([a-z]+)([0-9]+)@'.preg_quote(getDolGlobalString('EMAIL_ALTERNATIVE_HOST_SIGNATURE'), '/').'/', $reference, $reg);
+						}
+
+						if ($resultsearchtrackid) {
+							// This is a Dolibarr reference of the server
 							$trackid = $reg[1].$reg[2];
 
 							$objectid = $reg[2];
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 352db2e0910..264dc86b440 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -2091,7 +2091,7 @@ NothingProcessed=Nothing done
 XEmailsDoneYActionsDone=%s emails qualified, %s emails successfully processed (for %s record/actions done)
 RecordEvent=Record an event in agenda (with type Email sent or received)
 CreateLeadAndThirdParty=Create a lead (and a third party if necessary)
-CreateTicketAndThirdParty=Create a ticket (linked to a third party if the third party was loaded by a previous operation, with no third party otherwise)
+CreateTicketAndThirdParty=Create a ticket (linked to a third party if the third party was loaded by a previous operation or was guessed from a tracker in email header, without third party otherwise)
 CodeLastResult=Latest result code
 NbOfEmailsInInbox=Number of emails in source directory
 LoadThirdPartyFromName=Load third party searching on %s (load only)