Please note that each bounce message is different. Therefore, information relating to addresses, IP numbers, and domain names listed below will differ from what is listed in the header information of the bounced message you receive. If you received a bounce message that contains one of the following messages, find the description of that message below for more information.
Most Common Bounce Reasons:
• Message rejected: The mailserver used does not match the domain specified
• 450: Recipient address rejected: Domain not found
• 450: unknown[10.123.123.123] : Client host rejected: Too many mails sent!; from=<firstname.lastname@example.org>
• 500: Recipient address rejected: Recipient mailbox is full
• 503: Improper use of SMTP command pipelining
• 540: email@example.com : Recipient address rejected: Your email has been returned because the intended recipient's email account has been suspended.
• 550: firstname.lastname@example.org: User unknown
• 550: name.mail.domain.net[10.x.xxx.xx]: Client host rejected: More than X concurrent connections per subnet
• 554: unknown[10.xxx.xxx.xx]: Client host rejected: Access denied
• 554: Client host rejected: cannot find your hostname, [10.xxx.xx.xxx]; email@example.com
• 554: Sender address rejected: Access denied
• 554: Service unavailable; [10.xxx.xx.xxx] blocked using relays.ordb.org, reason: This mail was handled by an open relay - please visit http://ORDB.org/lookup/?host=10.X.X.X
• 554: Relay access denied; from= to= - reject: header Subject: (Email Subject Line)
• Remote host said: 554 Service unavailable; [XXX.XXX.XXX.XXX] blocked using blackholes.intelliwire.net
explanation of bounced messages
Message rejected: The mailserver used does not match the domain specified
This message was not delivered because the headers indicate that it is coming from an email service other than the one indicated by the IP address. It is a common practice of Spammers to forge message headers in this manner, therefore this type of message will not be delivered.
For example, a message with a return address of firstname.lastname@example.org which was actually sent through a service with an IP address which does not match domainname.com will be rejected for this reason.
450: Recipient address rejected: Domain not found
450 unknown[10.123.123.123]: Client host rejected: Too many mails sent!; email@example.com
To protect our email system from being flooded by email list administrators, or in some cases by "spammers," we have instituted "rules" to gate incoming email to our system. These rules are based on common industry practices as to how to send large amounts of email without causing potential harm to the recipient's mail server.
Unfortunately, from time to time, we are forced to "soft bounce" messages because the mailing it was a part of exceeded one or more of our rules for incoming email. However, a "soft bounce" means that we will deliver the email in question, although it will result in a short delay in receipt.
We want you to know that we are already working with various email list administrators and other large Web sites to ensure that they conform to reasonable methods of delivering bulk mailings when generating large mailings to our userss, and we regret any inconvenience these "soft bounces" may cause, now or in the future.
It's also possible that the mail servers that were responsible for delivering the message to us have been blocked due to a high number of concurrent connections. This type of abuse is usually indicative of a "spammer" trying to send unsolicited commercial emails. Therefore, the message might have been blocked along with all other messages from that mail server. Since the email provider in question has been added to our block list, this bounced message will continue to be generated. Please have the mailing list manager or administrator in question contact us at firstname.lastname@example.org for further assistance.
500: Recipient address rejected: Recipient mailbox is full
The Intelliwire Email address in question is over its storage limit. Intelliwire Email accounts are currently set up with 125 MB of storage space, or 10,000 emails. Furthermore, if a user of Intelliwire goes over the 125 MB storage or 10,000 email limit, emails sent to that account will be "bounced" back to the sender until the space has been cleared. Unfortunately, we have no way of knowing if the user in question is aware of the status of their storage space, or the frequency with which they check their quota.
503: Improper use of SMTP command pipelining
The message was sent in a non-conventional, non-standard way. You should have the sender of this email contact us if they have further questions.
540: < email@example.com >: Recipient address rejected: Your email has been returned because the intended recipient's email account has been suspended. The account must be re-activated to receive incoming messages.
As noted in the Intelliwire Email Terms of Service, email accounts that have not been accessed for more than 60 days may be deactivated.
If you are a Intelliwire user, you can reactivate your account by simply signing in to your Email account, where you will be prompted with a message asking if you would like to reactivate your email account. After agreeing to do so, your email address will automatically be reactivated. Please note it may take up to two hours for you to begin receiving new email messages after you've reactivated the account, and remember to access your email at least once every 60 days to prevent this from occurring in the future.
If you are not a Intelliwire user and you received a "bounced" message to a Intelliwire email user, we suggest that you find an alternate means of communicating with them to let them know their email account is now inactive, and that they need to access their Intelliwire Inbox to reactive their email account.
550: firstname.lastname@example.org: User unknown
If the email account you are sending to is generating a "bounce" message that states "User Unknown" when attempting to send email to it, it could mean that the email account does not exist, not active, or the email address was typed incorrectly.
Please confirm the spelling of the email address in question, and verify that this is an active account.
If you are sure that the Intelliwire Email account in question has been fully activated, and the account in question is still generating "User Unknown" bounced messages, please contact your email administrator, and ask them to contact us at email@example.com for further assistance.
550: name.mail.domain.net[10.x.xxx.xx]: Client host rejected: More than 20 concurrent connections per subnet
This can occur when the mail servers that were responsible for delivering the message to us were temporarily blocked due to a high number of concurrent connections. This type of abuse is usually indicative of a "spammer" trying to send unsolicited commercial emails. Therefore, the message might have been blocked along with all other messages from that mail server at that time. However, it is likely that the block was subsequently removed.
554: unknown[10.xxx.xxx.xx]: Client host rejected: Access denied
554: Sender address rejected: Access denied
Your message is being blocked by our site because it either had characteristics similar to "spam" (unsolicited commercial email), or you're sending your message from an Internet Service Provider (ISP) or email provider who has been identified as having allowed spam to be generated from their facilities. For the protection of our user, we do not deliver bulk, unsolicited emails to Intelliwire Email accounts.
For example, it is possible that the subject line of the message in question may have been identified by our email servers as unsolicited commercial mail (AKA: Spam) and thus was returned. We ask that you retry sending your message with a different subject line. Please ensure that the subject line of the message does not contain more than 15 identical characters.
For instance, if a subject line contains 15 identical consecutive characters, such as 15 "a"s or 15 "!"s it may be rejected on our end.
However, if your ISP or email provider has been added to our block list, your email message to @intelliwire.net will continue to be rejected or a bounced message will continue to be generated. If this is the case, please contact your email administrator, and ask them to contact us for further assistance.
554: Sender address rejected: Access denied
This address is listed on our "black list" of email addresses, or is on the black list of one of the spam filter lists we use to lessen the amount of Spam our users receive. You should have the owner of this address contact us if they have questions.
554: Service unavailable; [10.xxx.xx.xxx] blocked using relays.ordb.org, reason: This mail was handled by an open relay - please visit http://ORDB.org/lookup/?host=10.X.X.X
The message in question was blocked because it came from a domain or IP address that is currently listed with one of our Spam filters. These filters are utilized to help prevent excessive spamming to our email providers. If your domain or IP address is listed with any of the Spam filters we currently use, your message will not be delivered.
If you believe that you have been unfairly added to any or all of these particular lists, please contact the website in question:
• Ordb (relays.ordb.org)
• Spamcop (bl.spamcop.net)
• Osirusoft (socks.relays.osirusoft.com)
• Wirehub (blackholes.wirehub.net)
• Spamhaus (www.spamhaus.org)
554: Client host rejected: cannot find your hostname, [10.xxx.xx.xxx]; firstname.lastname@example.org
554: Relay access denied; email@example.com firstname.lastname@example.org
This error means that the person sending the email was not authorized to use the email server (SMTP) to send email. They should contact their ISP or email provider.
reject: header Subject: (Email Subject Line Here)
This subject line is on our "black list" of subject lines, or is on the black list of one of the spam filter lists we use to lessen the amount of Spam our users receive. You should have the sender of this email contact us if they have questions, or ask them to change the subject line, which unfortunately appears to have been used as the subject of a "spam" message at some time.
Remote host said: 554 Service unavailable; [XXX.XXX.XXX.XXX] blocked using blackholes.intelliwire.net
We have recently received a large number of abuse complaints regarding your account (and/or your ISP). As a result, we have bounced your email message back to you.
This means your IP number (represented above by XXX.XXX.XXX.XXX) has been blocked due to spamming activity by you, or someone using the same IP address or IP address range from your ISP. You may wish to let your ISP know of the situation. While this blocks are usually temporary, if we see repeated activity from this IP address or IP address range, it may be permanently blocked from sending email to our mail system