https://github.com/the-djmaze/snappymail/pull/965#discussion_r1111953373

snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/File.php

@@ -23,11 +23,7 @@ class File extends \MailSo\Log\Driver
 	function __construct(string $sLoggerFileName)
 	{
 		parent::__construct();
-		$this->SetLoggerFileName($sLoggerFileName);
-	}
 
-	public function SetLoggerFileName(string $sLoggerFileName)
-	{
 		$sLogFileDir = \dirname($sLoggerFileName);
 		if (!\is_dir($sLogFileDir)) {
 			\mkdir($sLogFileDir, 0755, true);
@@ -37,19 +33,14 @@ class File extends \MailSo\Log\Driver
 
 	protected function writeImplementation($mDesc) : bool
 	{
-		return $this->writeToLogFile($mDesc);
+		if (\is_array($mDesc)) {
+			$mDesc = \implode("\n\t", $mDesc);
+		}
+		return \error_log($mDesc . "\n", 3, $this->sLoggerFileName);
 	}
 
 	protected function clearImplementation() : bool
 	{
 		return \unlink($this->sLoggerFileName);
 	}
-
-	private function writeToLogFile($mDesc) : bool
-	{
-		if (\is_array($mDesc)) {
-			$mDesc = \implode("\n\t", $mDesc);
-		}
-		return \error_log($mDesc . "\n", 3, $this->sLoggerFileName);
-	}
 }

snappymail/v/0.0.0/app/libraries/MailSo/Log/Drivers/StderrStream.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of MailSo.
+ *
+ * (c) 2023 DJMaze
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace MailSo\Log\Drivers;
+
+/**
+ * @category MailSo
+ * @package Log
+ * @subpackage Drivers
+ */
+class StderrStream extends \MailSo\Log\Driver
+{
+	protected function writeImplementation($mDesc) : bool
+	{
+		return 0 < \fwrite(STDERR, $mDesc . "\n");
+	}
+
+	protected function clearImplementation() : bool
+	{
+		return true;
+	}
+}

snappymail/v/0.0.0/app/libraries/RainLoop/Actions.php

@@ -127,6 +127,8 @@ class Actions
 			$sLogFileName = $this->oConfig->Get('logs', 'filename', '');
 			if ('syslog' === $sLogFileName) {
 				$oDriver = new \MailSo\Log\Drivers\Syslog();
+			} else if ('stderr' === $sLogFileName) {
+				$oDriver = new \MailSo\Log\Drivers\StderrStream();
 			} else {
 				$sLogFileFullPath = \trim($this->oConfig->Get('logs', 'path', '')) ?: \APP_PRIVATE_DATA . 'logs';
 				\is_dir($sLogFileFullPath) || \mkdir($sLogFileFullPath, 0700, true);

snappymail/v/0.0.0/app/libraries/RainLoop/Config/Application.php

@@ -340,7 +340,8 @@ Examples:
   filename = "log-{date:Y-m-d}.txt"
   filename = "{date:Y-m-d}/{user:domain}/{user:email}_{user:uid}.log"
   filename = "{user:email}-{date:Y-m-d}.txt"
-  filename = "syslog"'),
+  filename = "syslog"
+  filename = "stderr"'),
 
 				'auth_logging' => array(false, 'Enable auth logging in a separate file (for fail2ban)'),
 				'auth_logging_filename' => array('fail2ban/auth-{date:Y-m-d}.txt'),