WHEN I SEND S0ME ATTACHMENT MORE THAT 3 MB .AM RECIEVEING THE FOLLOWING MESSAGES.
451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts"
BUT I CAN SEND MAIL NORMAIL WITHOUR ATTACHMENT TO YAHOO..
THIS IS ONLY ISSUE WITH MAILS SEND TO YAHOO , COULD YOU ALL HELP ME TO SOLVE THIS