smtpclient not working because my ISP is Spam blacklisted

I've never received any status email from my Slug. It
looks like my ISP (Comcast) is blacklisted by SPEWS
and therefore most mail servers won't accept mail from
me directly. Below is some smptclient -v output:

# cat /etc/services | smtpclient -v -s "services file"
-f nathan-75g4jgSCZc5Wk0Htik3J/w@xxxxxxxxxxxxxxxx 
nathan-+LBmYUDmh58@xxxxxxxxxxxxxxxx
foo.com --> 220 mail3.zoneedit.com ESMTP Postfix
foo.com <-- HELO Slug
foo.com --> 250 mail3.zoneedit.com
foo.com <-- MAIL FROM: <nathan-75g4jgSCZc5Wk0Htik3J/w@xxxxxxxxxxxxxxxx>
foo.com --> 250 Ok
foo.com <-- RCPT TO: <nathan-+LBmYUDmh58@xxxxxxxxxxxxxxxx>
foo.com --> 554 Service unavailable; Client host
[68.xx.xx.xx] blocked using l1.spews.dnsbl.sorbs.net;
! [1] comcast/attbi, see
http://spews.org/ask.cgi?S2963
foo.com --> 220 mail2.zoneedit.com ESMTP Postfix
foo.com <-- HELO Slug
foo.com --> 250 mail2.zoneedit.com
foo.com <-- MAIL FROM: <nathan-75g4jgSCZc5Wk0Htik3J/w@xxxxxxxxxxxxxxxx>
foo.com --> 250 Ok
foo.com <-- RCPT TO: <nathan-+LBmYUDmh58@xxxxxxxxxxxxxxxx>
foo.com --> 554 Service unavailable; Client host
[68.xx.xx.xx] blocked using l1.spews.dnsbl.sorbs.net;
! [1] comcast/attbi, see
http://spews.org/ask.cgi?S2963

smtpclient has a -S option to use a mail relay, which
my ISP does provide but apparently that -S option is
not currently supported, even though it is listed in
the help screen.

So is there a replacement for smtpclient I could use
to send mail that supports a relay? And if so, how
would I get the Slug email feature to use the new
client? It looks like the calls to smtpclient are
hard-coded into /lib/liblog.so.0.0. Do we have source
code for liblog.so?

Thanks

Nathan


                
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