·550 Mail is rejected by recipients[2016-6-20]
·554 mail server permanently rejected message[2016-6-20]
·550 5.1.1 Error: invalid recipients is found from[2016-6-17]
·553 5.3.0 alph154 DNSBL:ATTRBL 521[2016-6-16]
·554 5.7.1 The message from with the subject of matches a profile the Internet co[2016-6-16]
·550 Requested action not taken: mail is rejected[2016-6-16]
·550 mailbox rejected[2016-6-16]
·554 5.7.1 Recipient address rejected: disk quota of recipient is full![2016-6-8]
·553 refused, the IP is listed in spamhaus.org(SPAMHAUS BLOCKLIST ADDRESS IS WRON[2016-6-7]
·554 5.2.0 3mH71t02B1KP63P01mHAge Spam content found[2016-6-7]
·554 5.7.1 DAS41 Your mail is blocked automatically by anti-spam system. (E04)[2016-6-7]
·554 A.16 scb7@dgkfn.com... in user's email,domain blacklist(Header From)[2016-6-5]
·421 connection limit exceeded[2016-6-1]
·554 5.5.1 Error: no valid recipients[2016-6-1]
·598 ip address in blacklist for more details Please see[2016-6-1]
·553 #5.1.8 Domain of sender address does not exist[2016-5-31]
·550 The domain sg-international.com is currently suspended. Try later.[2016-5-31]
·554 Service unavailable; Client host blocked by dnsbl.ahbl.org[2016-5-31]
·553 refused, SPF check softfail[2016-5-30]
·554 Message not allowed - [299][2016-5-26]
·550 You are blacklisted[2016-5-26]
·421 Sorry, SMTP server too busy right now (90) try again later[2016-5-26]
·weekly report病毒邮件泛滥[2016-5-26]
·550 JunkMail rejected 121.50.xx.xx is in an RBL on rbl.websitewelcome.com[2016-5-26]
·550 The host name specified in HELO does not match IP address[2016-5-26]