diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
index 1c945bae3..71b4acd97 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Message.php
@@ -299,7 +299,7 @@ class Message implements \JsonSerializable
 				foreach ($oMessage->oFrom as $oEmail) {
 					$sEmail = $oEmail->GetEmail();
 					foreach ($aAuth['dkim'] as $aDkimData) {
-						if (\strpos($sEmail, $aDkimData[1])) {
+						if (\str_contains($sEmail, $aDkimData[1])) {
 							$oEmail->SetDkimStatus($aDkimData[0]);
 						}
 					}