English SMTP Authentication E (en) (en) extended SMTP English English English English English Extended SMTP ESMTP Extended SMTP English English support SMTP authentication ESMTP Extended SMTP extended SMTP Extended SMTP (en) English English http://en.wikipedia.org/wiki/Extended_SMTP E SMTP autentificado https://en.wikipedia.org/wiki/Extended_SMTP#8BITMIME English English (en) English Extended SMTP English English English