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Pues eso es que no está instalado...
La comunidad de programadores en Perl de habla hispana.
http://perlenespanol.com/foro/
http://perlenespanol.com/foro/envio-de-emails-con-perl-t2276-10.html
500 Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Cannot find a SASL Connection library at lib/Net/SMTP.pm line 143
Unknown callback: 'authname'. (user|auth|language|pass)
SMTP RCPT command failed:
Este error es para esta linea:
$msg->send;
Unknown callback: 'authname'. (user|auth|language|pass)