{"record":{"id":"097489b188fb43dd","repo":"ellite/Wallos","slug":"this-lang-execute-this-sendmail","errorCode":null,"errorMessage":"$this->lang('execute') . $this->Sendmail","messagePattern":"\\$this->lang\\('execute'\\) \\. \\$this->Sendmail","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"critical","filePath":"libs/PHPMailer/PHPMailer.php","lineNumber":1767,"sourceCode":"            //allow sendmail to choose a default envelope sender. It may\n            //seem preferable to force it to use the From header as with\n            //SMTP, but that introduces new problems (see\n            //<https://github.com/PHPMailer/PHPMailer/issues/2298>), and\n            //it has historically worked this way.\n            $sendmailFmt = '%s -oi -t';\n        }\n\n        $sendmail = sprintf($sendmailFmt, escapeshellcmd($this->Sendmail), $this->Sender);\n        $this->edebug('Sendmail path: ' . $this->Sendmail);\n        $this->edebug('Sendmail command: ' . $sendmail);\n        $this->edebug('Envelope sender: ' . $this->Sender);\n        $this->edebug(\"Headers: {$header}\");\n\n        if ($this->SingleTo) {\n            foreach ($this->SingleToArray as $toAddr) {\n                $mail = @popen($sendmail, 'w');\n                if (!$mail) {\n                    throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);\n                }\n                $this->edebug(\"To: {$toAddr}\");\n                fwrite($mail, 'To: ' . $toAddr . \"\\n\");\n                fwrite($mail, $header);\n                fwrite($mail, $body);\n                $result = pclose($mail);\n                $addrinfo = static::parseAddresses($toAddr, true, $this->CharSet);\n                $this->doCallback(\n                    ($result === 0),\n                    [[$addrinfo['address'], $addrinfo['name']]],\n                    $this->cc,\n                    $this->bcc,\n                    $this->Subject,\n                    $body,\n                    $this->From,\n                    []\n                );\n                $this->edebug(\"Result: \" . ($result === 0 ? 'true' : 'false'));","sourceCodeStart":1749,"sourceCodeEnd":1785,"githubUrl":"https://github.com/ellite/Wallos/blob/52820e87ca5a6e105fdbb7f1c0c681bc0cfee2fd/libs/PHPMailer/PHPMailer.php#L1749-L1785","documentation":"sendmailSend() (Sendmail transport, called from postSend) throws the localized 'execute' text plus $this->Sendmail with STOP_CRITICAL when @popen($sendmail, 'w') fails while $SingleTo is enabled — i.e., PHP could not start the sendmail binary process to write the message to.","triggerScenarios":"$mail->isSendmail() with $mail->SingleTo=true; popen fails because the Sendmail path ($mail->Sendmail, default /usr/sbin/sendmail) does not exist or is not executable, safe_mode/open_basedir restrictions, or process/fork limits.","commonSituations":"Local dev machines without a sendmail-compatible MTA installed, misconfigured Sendmail path (e.g., pointing to msmtp that is not installed), containers stripped of sendmail, PHP deployed without permission to execute binaries.","solutions":["Verify the sendmail binary exists and is executable at $mail->Sendmail (default /usr/sbin/sendmail -t -i); adjust $mail->Sendmail accordingly","Install a sendmail-compatible MTA (postfix, msmtp) in the environment, or switch to SMTP: $mail->isSMTP() with host/auth settings","Check open_basedir/safe_mode and OS-level restrictions that block popen","Log the Sendmail path and test it manually: echo test | /usr/sbin/sendmail -t -i"],"exampleFix":"// before\n$mail->isSendmail();\n$mail->Sendmail = '/usr/sbin/sendmail'; // binary missing\n// after\nif (!is_executable('/usr/sbin/sendmail')) {\n    $mail->isSMTP();\n    $mail->Host = 'smtp.example.com';\n    $mail->SMTPAuth = true;\n    $mail->Username = '...';\n    $mail->Password = '...';\n} else {\n    $mail->isSendmail();\n}","handlingStrategy":"try-catch","validationCode":"$cmd = explode(' ', $mail->Sendmail)[0]; if (!is_executable($cmd)) { throw new RuntimeException(\"Sendmail binary not executable: $cmd\"); }","typeGuard":null,"tryCatchPattern":"try { $mail->send(); } catch (PHPMailer\\PHPMailer\\Exception $e) { if (str_contains($e->getMessage(), 'execute')) { log_mta_failure($e->getMessage()); fallback_to_smtp($mail); } else { throw $e; } }","preventionTips":["Verify the Sendmail path at deployment time (is_executable check)","Install an MTA (postfix/msmtp) in containers/images that use isSendmail()","Prefer SMTP transport in cloud/container environments","Watch for open_basedir/disable_functions restrictions on popen"],"tags":["php","phpmailer","sendmail","process-execution"],"backgroundTag":"command-not-found","analyzedSha":"52820e87ca5a6e105fdbb7f1c0c681bc0cfee2fd","analyzedAt":"2026-09-13T14:09:30.873Z","contentChangedAt":"2026-09-13T14:09:30.873Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}