Status codes: http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xml http://www.iana.org/assignments/smtp-enhanced-status-co

Status codes: http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xml http://www.iana.org/assignments/smtp-enhanced-status-codes/s... http://tools.ietf.org/html/rfc3463 http://tools.ietf.org/html/rfc3463 I'm guessing most e-mail client providers just haven't found a reason to prettify the responses. If anyone is up to the task, then can you explain PGP/GPG so the entire world can also understand and use that?