Teste 1 - Conexão porta 25:
2026-03-17 05:50:45 SERVER -&gt; CLIENT: 220-dedi-14932523.tvitecnologia.com.br ESMTP Exim 4.99.1 #2 Tue, 17 Mar 2026 02:50:45 -0300 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail.<br>
2026-03-17 05:50:45 CLIENT -&gt; SERVER: EHLO teste.tvitecnologia.com.br<br>
2026-03-17 05:50:45 SERVER -&gt; CLIENT: 250-dedi-14932523.tvitecnologia.com.br Hello teste.tvitecnologia.com.br [69.6.215.13]250-SIZE 52428800250-LIMITS MAILMAX=1000 RCPTMAX=50000250-8BITMIME250-PIPELINING250-PIPECONNECT250-AUTH PLAIN LOGIN250-STARTTLS250 HELP<br>
2026-03-17 05:50:45 CLIENT -&gt; SERVER: AUTH LOGIN<br>
2026-03-17 05:50:45 SERVER -&gt; CLIENT: 334 VXNlcm5hbWU6<br>
2026-03-17 05:50:45 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-03-17 05:50:45 SERVER -&gt; CLIENT: 334 UGFzc3dvcmQ6<br>
2026-03-17 05:50:45 CLIENT -&gt; SERVER: [credentials hidden]<br>
2026-03-17 05:50:47 SERVER -&gt; CLIENT: 535 Incorrect authentication data<br>
2026-03-17 05:50:47 SMTP ERROR: Password command failed: 535 Incorrect authentication data<br>
SMTP Error: Could not authenticate.<br>
2026-03-17 05:50:47 CLIENT -&gt; SERVER: QUIT<br>
2026-03-17 05:50:47 SERVER -&gt; CLIENT: 221 dedi-14932523.tvitecnologia.com.br closing connection<br>
❌ Erro: SMTP Error: Could not authenticate.

Teste 2 - Verificar domínio:
❌ Domínio sem registro MX