Aşağıda ki hatayı almamın sebebi ne olabilir? Bilgi sahibi arkadaşlardan yardımlarını rica ederim.


No products in the cartSending with mail()
Sendmail path: /usr/sbin/sendmail -t -i
Envelope sender: report@xdomain.com
To: info@yydomain.com
Subject: =?UTF-8?Q?=C4=B0leti=C5=9Fim_Formu?=
Headers: Date: Thu, 9 Jun 2022 12:09:37 +0000From: =?UTF-8?Q?=C4=B0leti=C5=9Fim_Formu?= <report@xdomain.com >Message-ID: <z5tMJPoQBoI3Bw8yBPz4pgfwcZ3IEOAz10vBfLVCag@xdomai n.com>X-Mailer: PHPMailer 6.6.0 (https://github.com/PHPMailer/PHPMailer)MIME-Version: 1.0Content-Type: text/html; charset=UTF-8Content-Transfer-Encoding: 8bit
Result: false
Could not instantiate mail function.

________________________

</div>2022-06-09 11:45:28 SERVER -&gt; CLIENT: 220 smtp.domain.com.tr ESMTP Symantec Messaging Gateway<br>

2022-06-09 11:45:28 CLIENT -&gt; SERVER: EHLO xdomain.com<br>

2022-06-09 11:45:28 SERVER -&gt; CLIENT: 250-smtp.domain.com.tr says EHLO to 185.xxx.46.XX:45412250-SIZE 20971520250-AUTH=LOGIN250-AUTH LOGIN250-8BITMIME250-PIPELINING250 ENHANCEDSTATUSCODES<br>

2022-06-09 11:45:28 CLIENT -&gt; SERVER: STARTTLS<br>

2022-06-09 11:45:28 SERVER -&gt; CLIENT: 500 5.5.2 unrecognized command<br>

2022-06-09 11:45:28 SMTP ERROR: STARTTLS command failed: 500 5.5.2 unrecognized command<br>

SMTP Error: Could not connect to SMTP host. STARTTLS command failed unrecognized command<br>

2022-06-09 11:45:28 CLIENT -&gt; SERVER: QUIT<br>

2022-06-09 11:45:28 SERVER -&gt; CLIENT: 221 2.3.0 smtp.domain.com.tr closing connection<br>

SMTP Error: Could not connect to SMTP host. STARTTLS command failed unrecognized command<br>