diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FetchResponse.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FetchResponse.php
index 2ccb712fb..c882df8f6 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FetchResponse.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FetchResponse.php
@@ -132,7 +132,7 @@ class FetchResponse
 	public static function isValidImapResponse(Response $oImapResponse) : bool
 	{
 		return
-			true !== $oImapResponse->IsStatusResponse
+			!$oImapResponse->IsStatusResponse
 			&& Enumerations\ResponseType::UNTAGGED === $oImapResponse->ResponseType
 			&& 3 < \count($oImapResponse->ResponseList) && 'FETCH' === $oImapResponse->ResponseList[2]
 			&& \is_array($oImapResponse->ResponseList[3]);
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
index a90009212..62263d4c8 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
@@ -515,6 +515,13 @@ class ImapClient extends \MailSo\Net\NetClient
 					$oResponse = $this->partialParseResponse();
 					$oResult->append($oResponse);
 
+					if ($oResponse->IsStatusResponse
+					 && Enumerations\ResponseType::UNTAGGED === $oResponse->ResponseType
+					 && Enumerations\ResponseStatus::PREAUTH === $oResponse->StatusOrIndex
+					) {
+						break;
+					}
+
 					// RFC 5530
 					if ($sEndTag === $oResponse->Tag && \is_array($oResponse->OptionalResponse) && 'CLIENTBUG' === $oResponse->OptionalResponse[0]) {
 						// The server has detected a client bug.