At 23:43 25/07/2001 -0500, Alex Lau wrote:

Is this protocol able to send external email? Thanks Alex

Yes. Setting Mailman's DELIVERY_MODULE configuration parameter to 'SMTPDirect ' tells Mailman to use SMTP to despatch outgoing mail to a host identified by the SMTPHOST configuration parameter.

SMTP, as I'm sure your know, is the main protocol used between Mail Transfer Agents to move email around the internet.