Bounce

Keywords or bounce email ContentCauses and Solution
Bounce email: User user@dd.net.cn is not found in server. It is possible that bounce emails are generated because you fill Chinese characters or other unsupported characters in address field. Generally, when there are Chinese characters in recipient's address, we give message "You have used incorrect format of address,and the system has correct it automatically.Please Are you sure you want the operations of system is correct, enter "Cancel and change by yourself" if not.
Keyword: Quota, exceed, hard limit, exceeding, storage allocation
Bounce email content:
1) <user@163.net> : Quota exceed the hard limit for user user01@163.net
2) <user@themail.com> : host ... said: 552 This person's account is exceeding their quota.
3) <user@hotmail.com> : exceeded storage allocation
4) <user@dgpage.com> : 552 Channel size limit exceeded
There is not enough space in recipient's mailbox to receive your email. Failed to receive and return to your email address,please contact the receiver in other ways or inform the receiver of deleting useless emails to free some space.

Keyword: not welcome, content rejected, mail blocked, Recipient reject

Bounce email information examples:
1) <user@163.net> : This mail is not welcome
2) <user@163.com> : Error: content rejected <user@163.net> :
3) Mail content rejected <user@21cn.com> : mail blocked.
4) <user@sohu.com> : host ... said: 550 Recipient reject
5) <user@126.com> : 550 CoremailSys: Your mail was blocked by NetEase AntiSpam+

It is possible that the receiving users set some rule(for example: keywords filter,users filter,email size filter,etc),please inform them check the settings.

Keywords: banned, isn't in my list of allowed rcpt hosts, domain is not welcome, Connection refused, Relaying denied, mail blocked
Bounce email examples:
1) <user01@weefth.com> : 571 user02@163.net... from mail01j.rapidsite.net You are banned, contacts your local admin.
2) <user@foodomain.com> : 553 sorry, that domain isn't in my list of allowed rcpt hosts
3) <user01@cbnweb.com> : 550<user02@cbnweb.com>... Relaying denied
4) <user01@home.com> : 550 5.0.0 > <user02@163.net> : Mail originating from that domain is not welcome here
5) <user@foodomain.com> : connect to mf2.cbnweb.com: Connection refused
6) <user01@public.guangzhou.gd.cn> : host ... said: 553 From <user@163.net>, mail blocked.
The causes are that you are likely to be listed in blacklist or not in list the receiver's system allow,please contact them to open whitelist for you or let system administrator to check log to make the process of sending clear.
Keywords: Host not found, bad host, domain unreachable, Connection refused
Returning email example:
1) <user01@sian.com>: Name service error for domain sian.com: Host not found : Name service error for 2,
2) <user01@zdl.net> : domain zdl.net: Host not found, try again
3) <user01@hot.163.net> : Name service error for domain hot.163.net: Host not found
4) <tzq@.powerise.com.cn> : bad host/domain syntax: ".powerise.com.cn"
5) <user01@shou.com> : connect to shou.com: Connection refused
6) <user01@aadf.com> : domain unreachable (Domain does not exist.)
The host or the receiver's domain is incorrect or the domains cannot be resolve correctly by system.And it fail to deliver because of incorrect domain behind @ to a larger extent.
Keywords: error in command, syntax error
Bounce email examples:
1) <user@ap.dragoco.com> : host ... said: 500 error in command
2) <"" m83832000@yahoo.com.cn william""@sina.com>: host ... said: 555 - syntax error (# 5.5.4 )

The major causes are the receiver system cannot recognize software or instruction system of sender when delivering to connect to receiver's system.Please use common software(for example Outlook Express or Foxmail) to compose email, or in the way of Web to send emails to reduce to chance to fail.

If it cannot be solved,please send again later. And the other kind of causes is the sender enter invalid characters(for example,""""/""""^") in recipient address field and these characters lead to sending failure.
Keywords: 550 CoremailSys: System is busy.
Bounce email content:
1) The mail to sales@flo.com.au is bounced because :
550 CoremailSys: System is busy.
2) You send to sales@flo.com.au Emails are returned because:
550 CoremailSys: System is busy.
Bounce email cause: because some keywords in your email subject or content triggered filter rules of system and your email are returned.
Solution: You can change the subject of email or let anti-spam system administrator to check rules according to bounce email.
Keywords: exceeds, maximum mail size, Data size
Bounce email information examples:
1) <user@brilliantprint.com.hk> : 552 mail size exceeds fixed maximum mail size: 7372800 bytes
2) <user@brilliantprint.com.hk> : 552 5.2.3 mail size exceeds fixed maximum mail size (7200000)
3) <user@pub.xaonline.com> : host smtp.xaonline.com[61.134.1.143] said: 552 Data size must not exceed 4096K bytes.
Bounce email causes: Because of the oversize of email from sender, the system of receiver reject this email.
Solution: This kind of failure caused by the receiver's system protection mechanism: rejecting oversized email from sender.You can use Division feature of Outlook express to divide an email to several parts to send.
Reture email example:
1) The mail to julia.dlc@aircity.com.cn is bounced because : SMTP error, MAIL FROM: 553 sorry, your mailserver is listed in bl.spamcop.net (Please see: http://www.spamcop.net/bl.shtml?61.135.129.15.bl.spamcop.net), mail from is not accepted here
Bounce email causes: http://www.spamcop.net 61.135.129.15 was listed in blacklist.
Solution: You can request mail system administrator to contacts the person who in charge of blacklist to remove.
Keywords: Operation to emails in the queue timed out, Rcpt queued timed out, Connection timed out
Return email example:
1) You send to sky_lee555@sina.com are return because : Operation to emails in the queue timed out.
2) The mail to betty.yu@cn.flashelec.com is bounced because : Rcpt queued timed out
3) <user@iris.sipp.ac.cn> : connect to iris.sipp.ac.cn: Connection timed out <user@126.COM> : no found target server
This kind of bounce emails have two causes:
1) Connection to server timed out. (Mail system does exist in this domain,but it cannot be connected due to network problem,especially between countries or the north and south.)
2) It is possible that receiver domain does not exist at all. And it cannot be connected
Solution:
1) Because of connection to server timed out due to network problem,email delivery fails.Please try to deliver this email, wait a moment or exchange to Telecom system if user frequently use in south.
2) Please check whether the receiver address exists and is correct.You also find domain MX records through NSLOOKUP.If you find out MX record,you can Telnet this IP port 25 and check whether it is connected.

1) Return information about rejecting IP connection:
Bounce email keywords: 520 This IP has too many concurrents, please try again later

2) Return information about rejecting user connection:
Bounce email keywords: 521 This User has too many concurrents, please try again later

3) Return information about rejecting email content:
Bounce email keywords: 550 System is busy.

4) Return information about rejecting HELO search failed email:
Bounce email keywords: 450 search HELO/EHLO Host Domain fail

5) Return information about rejecting HELO information failed email:
Bounce email keywords: 550 Reject HELO/EHLO Host Domain

1) Return information about rejecting IP connection:
The causes and solutions: When you forward emails or auto reply by virus computer, the system limits the number of forwarding emails and IP connection to servers. If you exceed the limit,bounce email is generated.

2) Return information about rejecting user connection:
The causes and solutions: The system limits the number of connections to server per minute and per user.If you exceed the limit,bounce email is generated. please contact system administrators.

3) Return information about rejecting email content:
The causes and solutions: If email subject or content trigger system rules, please change your subject or content of email or contacts system administrators.

4) Return information about rejecting HELO search failed email:
The causes and solutions: It is bounce email user test through commands.

5) Return information about rejecting HELO information failed email:
The causes and solutions: It is bounce email user test through commands.