Index: mailhandler/src/Plugin/inmail/Analyzer/PGPAnalyzer.php
===================================================================
--- mailhandler/src/Plugin/inmail/Analyzer/PGPAnalyzer.php	(revision 17)
+++ mailhandler/src/Plugin/inmail/Analyzer/PGPAnalyzer.php	(working copy)
@@ -250,7 +250,7 @@
     $sender = NULL;
     $user = NULL;
     $matches = [];
-    $from = $message->getFrom()->getAddress();
+    $from = $message->getFrom()[0]->getAddress();
 
     // Use signed headers to extract "from" address for PGP/MIME messages.
     if ($result->getContext('pgp')->getContextValue()['pgp_type'] == 'mime') {
Index: mailhandler/src/Plugin/inmail/Analyzer/SenderAnalyzer.php
===================================================================
--- mailhandler/src/Plugin/inmail/Analyzer/SenderAnalyzer.php	(revision 20)
+++ mailhandler/src/Plugin/inmail/Analyzer/SenderAnalyzer.php	(working copy)
@@ -44,7 +44,7 @@
     $sender = NULL;
     $user = NULL;
     $matches = [];
-    $from = $message->getFrom()->getAddress();
+    $from = $message->getFrom()[0]->getAddress();
 
     preg_match('/[^@<\s]+@[^@\s>]+/', $from, $matches);
     if (!empty($matches)) {