2026-07-28 19:09:32 SERVER -&gt; CLIENT: 220 mailsubosl1001.protonmail.ch ESMTP Postfix<br>
2026-07-28 19:09:32 CLIENT -&gt; SERVER: EHLO healththerapiesclinics.com.au<br>
2026-07-28 19:09:33 SERVER -&gt; CLIENT: 250-mailsubosl1001.protonmail.ch250-PIPELINING250-SIZE 36480000250-STARTTLS250-ENHANCEDSTATUSCODES250-8BITMIME250 CHUNKING<br>
2026-07-28 19:09:33 CLIENT -&gt; SERVER: STARTTLS<br>
2026-07-28 19:09:33 SERVER -&gt; CLIENT: 220 2.0.0 Ready to start TLS<br>
2026-07-28 19:09:33 CLIENT -&gt; SERVER: EHLO healththerapiesclinics.com.au<br>
2026-07-28 19:09:34 SERVER -&gt; CLIENT: 250-mailsubosl1001.protonmail.ch250-PIPELINING250-SIZE 36480000250-AUTH PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME250 CHUNKING<br>
2026-07-28 19:09:34 CLIENT -&gt; SERVER: AUTH LOGIN<br>
2026-07-28 19:09:34 SERVER -&gt; CLIENT: 334 VXNlcm5hbWU6<br>
2026-07-28 19:09:34 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-07-28 19:09:34 SERVER -&gt; CLIENT: 334 UGFzc3dvcmQ6<br>
2026-07-28 19:09:34 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-07-28 19:09:35 SERVER -&gt; CLIENT: 535 5.7.8 Error: authentication failed: authentication failed<br>
2026-07-28 19:09:35 SMTP ERROR: Password command failed: 535 5.7.8 Error: authentication failed: authentication failed<br>
SMTP Error: Could not authenticate.<br>
2026-07-28 19:09:35 CLIENT -&gt; SERVER: QUIT<br>
2026-07-28 19:09:35 SERVER -&gt; CLIENT: 221 2.0.0 Bye<br>
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting<br>
Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting