2026-11-05 19:32:33 SERVER -&gt; CLIENT: 220-alpha.mysecurecloudserver.com ESMTP Exim 4.100.1 #2 Fri, 06 Nov 2026 01:17:33 +0545 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.<br>
2026-11-05 19:32:33 CLIENT -&gt; SERVER: EHLO mobile.nepaliblooddonors.com<br>
2026-11-05 19:32:33 SERVER -&gt; CLIENT: 250-alpha.mysecurecloudserver.com Hello mobile.nepaliblooddonors.com [182.93.80.120]250-SIZE 52428800250-LIMITS MAILMAX=1000 RCPTMAX=50000250-8BITMIME250-PIPELINING250-PIPECONNECT250-AUTH PLAIN LOGIN250 HELP<br>
2026-11-05 19:32:33 CLIENT -&gt; SERVER: AUTH LOGIN<br>
2026-11-05 19:32:33 SERVER -&gt; CLIENT: 334 VXNlcm5hbWU6<br>
2026-11-05 19:32:33 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-11-05 19:32:33 SERVER -&gt; CLIENT: 334 UGFzc3dvcmQ6<br>
2026-11-05 19:32:33 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-11-05 19:32:36 SERVER -&gt; CLIENT: 535 Incorrect authentication data<br>
2026-11-05 19:32:36 SMTP ERROR: Password command failed: 535 Incorrect authentication data<br>
SMTP Error: Could not authenticate.<br>
2026-11-05 19:32:36 CLIENT -&gt; SERVER: QUIT<br>
2026-11-05 19:32:36 SERVER -&gt; CLIENT: 221 alpha.mysecurecloudserver.com closing connection<br>
SMTP Error: Could not authenticate.<br>
Message could not be sent. Mailer Error: SMTP Error: Could not authenticate.