diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Folders.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Folders.php
index 5f0c0da2f..573634157 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Folders.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Folders.php
@@ -119,6 +119,10 @@ trait Folders
 		}
 		if ($this->IsSupported('OBJECTID')) {
 			$aStatusItems[] = FolderResponseStatus::MAILBOXID;
+/*
+		} else if ($this->IsSupported('X-DOVECOT')) {
+			$aFetchItems[] = 'X-GUID';
+*/
 		}
 
 		$oFolderInfo = $this->oCurrentFolderInfo;
@@ -341,6 +345,9 @@ trait Folders
 //						$oResult->IsWritable = true;
 					} else if ('NOMODSEQ' === $key) {
 						// https://datatracker.ietf.org/doc/html/rfc4551#section-3.1.2
+					} else if ('MAILBOXID' === $key) {
+						// https://www.rfc-editor.org/rfc/rfc8474#section-4.2
+						$oResult->MAILBOXID = $oResponse->OptionalResponse[1];
 					}
 				}
 
@@ -409,7 +416,11 @@ trait Folders
 			}
 			// RFC 8474
 			if ($this->IsSupported('OBJECTID')) {
-				$aTypes[] = FolderStatus::MAILBOXID;
+				$aL[] = FolderStatus::MAILBOXID;
+/*
+			} else if ($this->IsSupported('X-DOVECOT')) {
+				$aL[] = 'X-GUID';
+*/
 			}
 
 			$aReturnParams[] = 'STATUS';
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
index 56f4028c4..f2052e7c6 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
@@ -78,6 +78,23 @@ trait Messages
 						break;
 				}
 			}
+			if ($this->IsSupported('OBJECTID')) {
+				$aFetchItems[] = FetchType::EMAILID;
+				$aFetchItems[] = FetchType::THREADID;
+			} else if ($this->IsSupported('X-GM-EXT-1')) {
+				// https://developers.google.com/gmail/imap/imap-extensions
+				$aFetchItems[] = 'X-GM-MSGID';
+				$aFetchItems[] = 'X-GM-THRID';
+/*
+			} else if ($this->IsSupported('X-DOVECOT')) {
+				$aFetchItems[] = 'X-GUID';
+*/
+			}
+/*
+			if ($this->IsSupported('X-GM-EXT-1') && \in_array(FetchType::FLAGS, $aFetchItems)) {
+				$aFetchItems[] = 'X-GM-LABELS';
+			}
+*/
 
 			$aParams = array($sIndexRange, $aFetchItems);
 
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Enumerations/FetchType.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Enumerations/FetchType.php
index 395644833..f3388cd57 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Enumerations/FetchType.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Enumerations/FetchType.php
@@ -53,6 +53,9 @@ abstract class FetchType
 	const BINARY_SIZE = 'BINARY.SIZE';
 	// RFC 4551
 	const MODSEQ = 'MODSEQ';
+	// RFC 8474
+	const EMAILID = 'EMAILID';
+	const THREADID = 'THREADID';
 
 	public static function BuildBodyCustomHeaderRequest(array $aHeaders, bool $bPeek = true) : string
 	{
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FolderInformation.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FolderInformation.php
index 7e323749d..b5fe6a367 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FolderInformation.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/FolderInformation.php
@@ -63,6 +63,7 @@ class FolderInformation implements \JsonSerializable
 	public function jsonSerialize()
 	{
 		return array(
+			'id' => $this->MAILBOXID,
 			'Name' => $this->FolderName,
 			'Flags' => $this->Flags,
 			'PermanentFlags' => $this->PermanentFlags,
@@ -73,7 +74,6 @@ class FolderInformation implements \JsonSerializable
 			'UidValidity'   => $this->UIDVALIDITY,
 			'Highestmodseq' => $this->HIGHESTMODSEQ,
 			'Appendlimit'   => $this->APPENDLIMIT,
-			'Mailboxid'     => $this->MAILBOXID,
 */
 		);
 	}
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
index 2d254fe0c..2b2e8f140 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/ImapClient.php
@@ -293,6 +293,9 @@ class ImapClient extends \MailSo\Net\NetClient
 		if (!$this->aCapabilityItems) {
 			$this->setCapabilities($this->SendRequestGetResponse('CAPABILITY'));
 		}
+/*
+		$this->aCapabilityItems[] = 'X-DOVECOT';
+*/
 		return $this->aCapabilityItems;
 	}
 
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Traits/Status.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Traits/Status.php
index 425f5e84f..814093894 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Traits/Status.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Traits/Status.php
@@ -96,6 +96,8 @@ trait Status
 	{
 		if ('EXISTS' === $name) {
 			$name = 'MESSAGES';
+		} else if ('X-GUID' === $name) {
+			$name = 'MAILBOXID';
 		}
 		if (\property_exists(__TRAIT__, $name)) {
 			if ('MAILBOXID' !== $name) {
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Folder.php b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Folder.php
index 6e62b7195..f0ee21c81 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Folder.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Mail/Folder.php
@@ -229,7 +229,12 @@ class Folder implements \JsonSerializable
 			'Flags' => $this->FlagsLowerCase(),
 //			'Extended' => $aExtended,
 //			'PermanentFlags' => $this->oImapFolder->PermanentFlags,
-			'Metadata' => $this->oImapFolder->Metadata()
+			'Metadata' => $this->oImapFolder->Metadata(),
+			'UidNext' => $this->oImapFolder->UIDNEXT,
+			// RFC 8621
+			'totalEmails' => $this->oImapFolder->MESSAGES,
+			'unreadEmails' => $this->oImapFolder->UNSEEN,
+			'id' => $this->oImapFolder->MAILBOXID
 		);
 	}
 }
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 c1f0e9e5e..5edba72ab 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
@@ -36,6 +36,12 @@ class Message implements \JsonSerializable
 		$sHeaderDate = '',
 		$aFlagsLowerCase = [],
 
+		/**
+		 * https://www.rfc-editor.org/rfc/rfc8474#section-5
+		 */
+		$sEmailId = '',
+		$sThreadId = '',
+
 		/**
 		 * @var \MailSo\Mime\EmailCollection
 		 */
@@ -287,16 +293,21 @@ class Message implements \JsonSerializable
 			$oBodyStructure = $oFetchResponse->GetFetchBodyStructure();
 		}
 
-		$sInternalDate = $oFetchResponse->GetFetchValue(FetchType::INTERNALDATE);
 		$aFlags = $oFetchResponse->GetFetchValue(FetchType::FLAGS);
 
 		$oMessage->sFolder = $sFolder;
 		$oMessage->iUid = (int) $oFetchResponse->GetFetchValue(FetchType::UID);
 		$oMessage->iSize = (int) $oFetchResponse->GetFetchValue(FetchType::RFC822_SIZE);
 		$oMessage->aFlagsLowerCase = \array_map('mb_strtolower', \array_map('\\MailSo\\Base\\Utils::Utf7ModifiedToUtf8', $aFlags ?: []));
+		$oMessage->iInternalTimeStampInUTC = \MailSo\Base\DateTimeHelper::ParseInternalDateString(
+			$oFetchResponse->GetFetchValue(FetchType::INTERNALDATE)
+		);
 
-		$oMessage->iInternalTimeStampInUTC =
-			\MailSo\Base\DateTimeHelper::ParseInternalDateString($sInternalDate);
+		$oMessage->sEmailId = $oFetchResponse->GetFetchValue(FetchType::EMAILID)
+//			?: $oFetchResponse->GetFetchValue('X-GUID')
+			?: $oFetchResponse->GetFetchValue('X-GM-MSGID');
+		$oMessage->sThreadId = $oFetchResponse->GetFetchValue(FetchType::THREADID)
+			?: $oFetchResponse->GetFetchValue('X-GM-THRID');
 
 		$sCharset = $oBodyStructure ? Utils::NormalizeCharset($oBodyStructure->SearchCharset()) : '';
 
@@ -660,9 +671,13 @@ class Message implements \JsonSerializable
 			'Flags' => $this->aFlagsLowerCase,
 
 			// https://datatracker.ietf.org/doc/html/rfc8621#section-4.1.1
+			'id' => $this->sEmailId,
+//			'blobId' => $this->sEmailIdBlob,
+			'threadId' => $this->sThreadId,
+//			'mailboxIds' => ['mailboxid'=>true],
+//			'keywords' => \array_fill_keys($this->aFlagsLowerCase, true),
 			'size' => $this->iSize,
 			'receivedAt' => \gmdate('Y-m-d\\TH:i:s\\Z', $this->iInternalTimeStampInUTC)
-//			'keywords' => \array_fill_keys($this->aFlagsLowerCase, true)
 		);
 	}
 }
diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Response.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Response.php
index c5bbaf65a..b5582f010 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Response.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Response.php
@@ -269,17 +269,12 @@ trait Response
 			$aResult = $mResponse->jsonSerialize();
 
 			$aStatus = $mResponse->Status();
-			if ($aStatus && isset($aStatus['MESSAGES'], $aStatus['UNSEEN'], $aStatus['UIDNEXT'])) {
-				$aResult = \array_merge(
-					$aResult,
-					[
-						'totalEmails' => (int) $aStatus['MESSAGES'],
-						'unreadEmails' => (int) $aStatus['UNSEEN'],
-						'UidNext' => (int) $aStatus['UIDNEXT'],
-						'Hash' => $this->MailClient()->GenerateFolderHash(
-							$mResponse->FullName(), $aStatus['MESSAGES'], $aStatus['UIDNEXT'],
-								empty($aStatus['HIGHESTMODSEQ']) ? 0 : $aStatus['HIGHESTMODSEQ'])
-					]
+			if ($aStatus && isset($aStatus['MESSAGES'], $aStatus['UIDNEXT'])) {
+				$aResult['Hash'] = $this->MailClient()->GenerateFolderHash(
+					$mResponse->FullName(),
+					$aStatus['MESSAGES'],
+					$aStatus['UIDNEXT'],
+					empty($aStatus['HIGHESTMODSEQ']) ? 0 : $aStatus['HIGHESTMODSEQ']
 				);
 			}