2025-12-07 02:52:29 SERVER -&gt; CLIENT: 220 lin186.loading.es ESMTP Postfix<br>
2025-12-07 02:52:29 CLIENT -&gt; SERVER: EHLO brownweb.loading.net<br>
2025-12-07 02:52:29 SERVER -&gt; CLIENT: 250-lin186.loading.es250-PIPELINING250-SIZE 102400000250-ETRN250-AUTH DIGEST-MD5 CRAM-MD5 PLAIN LOGIN250-ENHANCEDSTATUSCODES250-8BITMIME250-DSN250 CHUNKING<br>
2025-12-07 02:52:29 CLIENT -&gt; SERVER: AUTH CRAM-MD5<br>
2025-12-07 02:52:29 SERVER -&gt; CLIENT: 334 PDI0Mjc4NjQ4MDMuMzQ2ODM3NEBsaW4xODYubG9hZGluZy5lcz4=<br>
2025-12-07 02:52:29 CLIENT -&gt; SERVER: [credentials hidden]<br>
2025-12-07 02:52:29 SERVER -&gt; CLIENT: 535 5.7.8 Error: authentication failed: authentication failure<br>
2025-12-07 02:52:29 SMTP ERROR: Username command failed: 535 5.7.8 Error: authentication failed: authentication failure<br>
SMTP Error: Could not authenticate.<br>
2025-12-07 02:52:29 CLIENT -&gt; SERVER: QUIT<br>
2025-12-07 02:52:29 SERVER -&gt; CLIENT: 221 2.0.0 Bye<br>
SMTP Error: Could not authenticate.<br>
Error al enviar: SMTP Error: Could not authenticate.