IP address Not found when using sendgrid

Help, i just setup new server and usually i imported the same exim setting from my previous server. but when finish exim not sending my email, it defer and stuck in mail queue. I delivered manually and got failed message. cwd=/usr/local/cpanel/whostmgr/docroot 4 args: /usr/sbin/exim -v -M 1ecwai-0007FX-GA delivering 1ecwai-0007FX-GA LOG: host_lookup_failed MAIN no IP address found for host smtp.sendgrid.net LOG: MAIN == targetaddress@gmail.com R=send_via_sendgrid defer (-32): lookup of host "smtp.sendgrid.net" failed in send_via_sendgrid router
i has setup another 2 servers and result is same. but its not problem in my old server. Please help me to fix it.