I can receive e-mails, but not send, neither to myself.

I have one external ISP e-mail server, and we must access it from internal lan.

I followed these steps:

e-mail cliente: Outlook express configuration -> internal BM IP address on each account.

BM Setup-> Mail proxy -> Primary mail domain name: mail.MyDomain.com.br
Internal mail domain name: mail.MyDomain.com.br
Internal mail server name: mail.MyDomain.com.br
POP3 Mail Server name: mail.MyDomain.com.br
Spool Directory: DATA:\ETC\PROXY\SPOOL

Access Rules->
SMTP, Allow, 25, TCP&UDP, Source: Any, Destination: Any
POP3, Allow, 110, TCP, Source: Any, Destination: Any

Thanks for your help.