diff --git a/lib/os/class.ISPConfigBaseOS.inc.php b/lib/os/class.ISPConfigBaseOS.inc.php
index 52ac6aeec2782b36fda4c33c034d10f907798305..8d06c441f340c17da21a72228406dd446a69a7fd 100644
--- a/lib/os/class.ISPConfigBaseOS.inc.php
+++ b/lib/os/class.ISPConfigBaseOS.inc.php
@@ -320,6 +320,70 @@ class ISPConfigBaseOS {
 		return true;
 	}
 
+	protected function replaceLine($filename, $search_pattern, $new_line, $strict = false, $append = 1) {
+		$lines = @file($filename);
+		$out = '';
+		$found = 0;
+		if(is_array($lines)) {
+			foreach($lines as $line) {
+				if($strict === false && preg_match('/^REGEX:(.*)$/', $search_pattern)) {
+					if(preg_match(substr($search_pattern, 6), $line)) {
+						$out .= $new_line."\n";
+						$found = 1;
+					} else {
+						$out .= $line;
+					}
+				} elseif($strict === false) {
+					if(stristr($line, $search_pattern)) {
+						$out .= $new_line."\n";
+						$found = 1;
+					} else {
+						$out .= $line;
+					}
+				} else {
+					if(trim($line) == $search_pattern) {
+						$out .= $new_line."\n";
+						$found = 1;
+					} else {
+						$out .= $line;
+					}
+				}
+			}
+		}
+
+		if($found == 0) {
+			//* add \n if the last line does not end with \n or \r
+			if(substr($out, -1) != "\n" && substr($out, -1) != "\r" && filesize($filename) > 0) $out .= "\n";
+			//* add the new line at the end of the file
+			if($append == 1) {
+				$out .= $new_line."\n";
+			}
+		}
+		file_put_contents($filename, $out);
+	}
+
+	protected function removeLine($filename, $search_pattern, $strict = 0) {
+		if($lines = @file($filename)) {
+			$out = '';
+			foreach($lines as $line) {
+				if($strict == 0 && preg_match('/^REGEX:(.*)$/', $search_pattern)) {
+					if(!preg_match(substr($search_pattern, 6), $line)) {
+						$out .= $line;
+					}
+				} elseif($strict == 0) {
+					if(!stristr($line, $search_pattern)) {
+						$out .= $line;
+					}
+				} else {
+					if(!trim($line) == $search_pattern) {
+						$out .= $line;
+					}
+				}
+			}
+			file_put_contents($filename, $out);
+		}
+	}
+
 	protected function getInstallCommand($packages) {
 		if(is_string($packages)) {
 			$packages = array($packages);
diff --git a/lib/os/class.ISPConfigDebian12OS.inc.php b/lib/os/class.ISPConfigDebian12OS.inc.php
index dd215577b7dcb0b04c1ed7d159e27768571bb65c..f4383a50213e1a8ed2996799cc57af7cdb420ed9 100644
--- a/lib/os/class.ISPConfigDebian12OS.inc.php
+++ b/lib/os/class.ISPConfigDebian12OS.inc.php
@@ -30,6 +30,7 @@ class ISPConfigDebian12OS extends ISPConfigDebian11OS {
 				unset($packages[$key]);
 			}
 			$packages[] = 'getmail6';
+			$packages[] = 'rsyslog';
 		} elseif($section === 'mail') {
 			$key = array_search('rar', $packages, true);
 			if($key !== false) {
@@ -70,4 +71,9 @@ class ISPConfigDebian12OS extends ISPConfigDebian11OS {
 	protected function getSystemPHPVersion() {
 		return '8.2';
 	}
+
+	protected function installRoundcube($mysql_root_pw) {
+		parent::installRoundcube($mysql_root_pw);
+		$this->replaceLine('/etc/roundcube/config.inc.php', "\$config['smtp_host']", "\$config['smtp_host'] = 'localhost:25';");
+	}
 }