[Mimedefang] non Mimedefang related... Need Help...

[Chad Stalvey]

Has anyone ever seen this? This is from my Log file and it seems to only be
happening when trying to send to windows mail servers. I'm running sendmail
8.12.3

Thanks!
/var/log/maillog:Aug 21 05:04:25 mail sendmail[3211]: g7KK27ar059219: to=<
ajones22 at yahoo.com>, ctladdr=<cschuh
@ounce.org> (2466/2466), delay=13:00:53, xdelay=00:08:59, mailer=esmtp,
pri=660477, relay=mx1.mail.yahoo.com. [
64.157.4.81], dsn=4.0.0, stat=I/O error
/var/log/maillog:Aug 21 05:23:17 mail sendmail[3211]: g7GJHtlP058706:
to=<waltmtg at msn.com>, delay=4+14:05:21, x
delay=00:00:18, mailer=esmtp, pri=4980677, relay=smtp-gw-4.msn.com.
[207.46.181.13], dsn=4.0.0, stat=I/O error
/var/log/maillog:Aug 21 05:23:22 mail sendmail[3211]: g7H0RXlP077907:
to=<LHSeiler at PBSJ.com>, delay=4+08:55:48,
 xdelay=00:00:03, mailer=esmtp, pri=6452786, relay=smtp.pbsj.com.
[12.16.16.67], dsn=4.0.0, stat=I/O error
/var/log/maillog:Aug 21 05:23:52 mail sendmail[3211]: g7GEoblP034491: to=<
ajones22 at yahoo.com>, ctladdr=<cschuh
@ounce.org> (2466/2466), delay=4+18:32:54, xdelay=00:00:30, mailer=esmtp,
pri=14843379, relay=mx2.mail.yahoo.co
m. [64.157.4.82], dsn=4.0.0, stat=I/O error