Fetchmail/SMTP Errors

[David Baron <d_baron@012.net.il>]

I am getting these every five minutes or so:

FROM:<jameswellington000.org@[71.121.223.194]> SIZE=8814")
2010-06-10 19:00:32 SMTP call from localhost (dovidhalevi) [127.0.0.1] 
dropped: too many syntax or protocol errors (last command was "MAIL 

And a series like this as well:

Jun 10 15:26:03 dovidhalevi fetchmail[6514]: SMTP error: 501 
<c@[63.134.215.170]>: domain literals not allowed
Jun 10 15:26:04 dovidhalevi fetchmail[6514]: SMTP error: 501 
<MICROSOFT@[74.222.214.97]>: domain literals not allowed
Jun 10 15:26:04 dovidhalevi fetchmail[6514]: SMTP error: 501 
<drchanjohn.hsbc@[71.121.223.194]>: domain literals not allowed
Jun 10 15:26:05 dovidhalevi fetchmail[6514]: SMTP error: 501-
<jameswellington000.org@[71.121.223.194]>: domain literals not allowed^M 501 
Too many syntax or protocol errors
Jun 10 15:26:05 dovidhalevi fetchmail[6514]: SMTP error: 501 
<microsoftaward.hotmail.co.uk@[24.178.8.197]>: domain literals not allowed
Jun 10 15:26:05 dovidhalevi fetchmail[6514]: SMTP error: 501 
<fedexcouriercompany111.yahoo.com@[98.110.119.254]>: domain literals not 
allowed
Jun 10 15:26:06 dovidhalevi fetchmail[6514]: SMTP error: 501 
<microsecurityclaimsdepartment.uk@[76.30.169.219]>: domain literals not 
allowed

All of these are spams. Only the jameswellington are being "dropped."

I would like all of this to disappear. How do I stop this?