diff --git a/htdocs/admin/emailcollector_card.php b/htdocs/admin/emailcollector_card.php
index 2635156411f..8dfafb19b63 100644
--- a/htdocs/admin/emailcollector_card.php
+++ b/htdocs/admin/emailcollector_card.php
@@ -146,6 +146,7 @@ if (GETPOST('addfilter', 'alpha')) {
 	$emailcollectorfilter->rulevalue = GETPOST('rulevalue', 'alpha');
 	$emailcollectorfilter->fk_emailcollector = $object->id;
 	$emailcollectorfilter->status = 1;
+
 	$result = $emailcollectorfilter->create($user);
 
 	if ($result > 0) {
diff --git a/htdocs/emailcollector/class/emailcollectorfilter.class.php b/htdocs/emailcollector/class/emailcollectorfilter.class.php
index c19610f14ad..cff80aa4153 100644
--- a/htdocs/emailcollector/class/emailcollectorfilter.class.php
+++ b/htdocs/emailcollector/class/emailcollectorfilter.class.php
@@ -158,6 +158,7 @@ class EmailCollectorFilter extends CommonObject
 	public function create(User $user, $notrigger = false)
 	{
 		global $langs;
+
 		if (empty($this->type)) {
 			$langs->load("errors");
 			$this->errors[] = $langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("Type"));
@@ -169,6 +170,12 @@ class EmailCollectorFilter extends CommonObject
 			return -2;
 		}
 
+		if (in_array($this->type, array('to')) && strpos($this->rulevalue, '+') != false) {
+			$langs->load("errors");
+			$this->errors[] = $langs->trans("ErrorCharPlusNotSupportedByImapForSearch");
+			return -3;
+		}
+
 		return $this->createCommon($user, $notrigger);
 	}
 
diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index afcc12e9362..056e2088611 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -294,6 +294,7 @@ ErrorQuantityIsLimitedTo=Quantity is limited to %s
 ErrorFailedToLoadThirdParty=Failed to find/load thirdparty from id=%s, email=%s, name=%s
 ErrorThisPaymentModeIsNotSepa=This payment mode is not a bank account 
 ErrorStripeCustomerNotFoundCreateFirst=Stripe customer is not set for this thirdparty (or set to a value deleted on Stripe side). Create (or re-attach) it first.
+ErrorCharPlusNotSupportedByImapForSearch=IMAP search is not able to search into sender or recipient for a string containing the character + 
 
 # Warnings
 WarningParamUploadMaxFileSizeHigherThanPostMaxSize=Your PHP parameter upload_max_filesize (%s) is higher than PHP parameter post_max_size (%s). This is not a consistent setup.