problem with indiatimes mail

[rajnish kumar]

Dear experts
                  I have configured kolab2.0 it's fine but if i
sending mail to indiatimes.com mail it gives error like this

May 18 12:49:00 rhel4 <info> postfix/smtp[5205]: 7186E25F0C3:
to=<kumarrajnishgupta at indiatimes.com>, relay=none, delay=5,
status=deferred (connect to smtp.indiatimes.com[203.199.93.5]: server
refused to talk to me: 550 Too many invalid recipients  )

but we are able to send mail other domain like gmail and yahoo.

with regds
rajnish