Getting pounded .. sigh

[Rob Poe]

My mail server is getting POUNDED from 
193.252.22.157
193.252.22.158

Which is smtp1.wanadoo.co.uk  and smtp2.wanadoo.co.uk

I blacklisted the whole 193.252.22.x 

They're targeting my list server, and SpamAssassin is grabbing them
(along with the fact that the list server is membership only!!)

but I'm getting one every 5-10 seconds!!

grep 193.252.22 /var/log/maillog | wc     
   1863   62955  710320

May 22 11:49:02 mail sendmail[30768]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..
May 22 11:49:07 mail sendmail[30769]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..
May 22 11:49:13 mail sendmail[30770]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..
May 22 11:49:27 mail sendmail[30774]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..
May 22 11:49:29 mail sendmail[30775]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..
May 22 11:49:41 mail sendmail[30777]: ruleset=check_relay,
arg1=smtp2.wanadoo.co.uk, arg2=193.252.22.157, relay=smtp2.wanadoo.co.uk
[193.252.22.157], reject=583 5.0.0 Get lost..