best/easiest commandline email program for mass-email

[Alex Janssen]

I got it configured to go to my ISP's SMTP server, but it won't login 
because I don't know at this point how to set up the login in postfix.

I am now getting the following postfix error in syslog:
status=bounced (host smtp.embarqmail.com[208.47.184.3] said: 554 
Authentication Failed, must login (in reply to RCPT TO command))

So, my question is how do I tell it to login?

Alex

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