Blat - A Win32 Command Line SMTP Mailer

I am calling blat like this:

blat somefile.txt -to me@me.com -subject "Test mail" -server srvIPAddress
-f sender@address.com -u theUn -pw thePw -serverPOP3 srvIPAddress -pu theUn
-ppw thePw -debug

Blat v2.6.2 w/GSS encryption (build : Feb 25 2007 12:06:19)

<<<getline<<< 220 server.address ESMTP Sendmail 8.12.11.20060614/8.12.6; F
ri, 13 Apr 2007 06:34:01 GMT
>>>putline>>> EHLO MYHOST
<<<getline<<< 250-server.address Hello rrcs-67-78-29-33.se.biz.rr.com [67
.78.29.33], pleased to meet you
<<<getline<<< 250-ENHANCEDSTATUSCODES
<<<getline<<< 250-PIPELINING
<<<getline<<< 250-8BITMIME
<<<getline<<< 250-SIZE
<<<getline<<< 250-DSN
<<<getline<<< 250-ETRN
<<<getline<<< 250-AUTH PLAIN LOGIN
<<<getline<<< 250-DELIVERBY
<<<getline<<< 250 HELP
Sending somefile.txt to me@me.com
Subject: Test mail
Login name is sender@address.com
>>>putline>>> AUTH PLAIN AGludHJlcGlkYWRtaW4ASW1vcnI1NTU=
<<<getline<<< 535 5.7.0 authentication failed
The SMTP server did not accept Auth PLAIN value.
Are your login userid and password correct?
>>>putline>>> AUTH LOGIN
Error: Connection to server was dropped.
The SMTP server does not require AUTH LOGIN.
Are you sure server supports AUTH?
>>>putline>>> MAIL FROM:<sender@address.com>
Error: Connection to server was dropped.
The SMTP server does not like the sender name.
Have you set your mail address correctly?
connection::put_data() unexpected error from send(): 10053
Error: Error sending data.
Error: Connection to server was dropped.

It does not seem to try to log into the POP3 server firt. What am I doing
wrong?

Thanks
cf