421 Server too busy
421-Microsoft ESMTP MAIL Service, Version: 5.0.2195.5600 ready at Service not available, closing transmission channel
421 4.3.1 ILLEGAL FROM <xxx@xxx.com> Sorry. Your IP has problems. This Connection will be closed. Please mail to mailsysop@hanmir.com (by using another e-mail server). Thank you.
421 4.3.2 Your IP(xxx.xxx.xxx.xxx) is filtered and this connection will be closed. You must register your IP to spammaster@hanafos.com By SpaceLee, the Lord of mail server
421 4.3.2 Your IP(xxx.xxx.xxx.xxx) is filtered and this connection will be closed. You must register your IP to http://realip.naver.com.
441 4.4.1 No answer from host
441 4.4.1 temporay dns failed <Hanmail.net>
450 <xxx@xxx.xxx> : Recipient address rejected: Greylisted for 300 seconds (see http://isg.ee.ethz.ch/tools/postgrey/help)
451 4.4.0 DNS resolving error
451 4.3.0 Other or undefined mail system status
451 4.3.0 Temporary system failure. Please try again later
451 4.4.2 Bad connection (io timeout)
451 Relay Server Not Ready
452 sorry, your recipient address is not in my local list
452 4.4.5 Requested mail action aborted: exceeded storage allocation
452 4.4.5 Disk write / Insufficient disk space error occurred
452 4.4.5 Insufficient disk space; try again later
452 4.4.5 MailBox or MessageQuota exceed for <E-mail Address>
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