Common Mail Error Messages and Solutions


  • Unknown or improperly formatted hostnames in helo (SMTP conversation)
    • Error Message: 554 cray-t90.L7.net: Helo command rejected: Host not found.
    • Error Message: 504 cray-t90.L7.net: Helo command rejected: need fully-qualified hostname.
    • Solution: Your mail server needs to be reconfigured to send a proper helo greeting.

  • Sending mail server may not send helo as one of Level Seven's mail servers
    • Error Message: 554 cray-t90.L7.net: Helo command rejected: You are not me.
    • Solution: Your mail server needs to be reconfigured to send a proper helo greeting.

  • Email may not exceed the maximum message size (currently 10MB)
    • Error Message: 552 Message size exceeds file system imposed limit
    • Error Message: 552 Error: message too large
    • Solution: Reduce the size of the email message (including attachments). Alternatively, use a different transfer medium (such as ftp) that is more appropriate for large file transfers. Also note that a file, when sent as an attachment, can be up to 30% larger than it appears on your drive.

  • Sender and recipient hostname MX record and NS records cannot be in reserved or non-routable IP address space. Wild-card addresses in use at some domain registries are not allowed.
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: reserved address in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: bogus address in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: loopback address in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: RFC1918 address in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: multicast address in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: wild-card .nu in MX or NS records (<IP block>)
    • Error Message: 554 <hostname>: (Sender address|Recipient address) rejected: wild-card .com and .net in MX or NS records (<IP block>)
    • Solution: For sender address errors (i.e. you are not a Level Seven customer and you are sending to a Level Seven customer), See your postmaster or hostmaster for assistance.
    • Solution: For recipient address errors (i.e. you are a Level Seven customer sending mail to a non-Level Seven customer), check the email address that you are sending to. Contact the postmaster of that domain for additional assistance.

  • Connections sent through http proxies will be blocked
    • Error Message: 221 Error: Forbidden command. Goodbye.
    • Solution: Mail should not be sent through http proxies.

  • Connections from customers sending spam will be blocked.
    • Error Message: 553 sorry, your mail (<IP Address>) is rejected. Your IP has been used to send spam or propagate viruses.
    • Solution: Run anti-virus software, and/or disable any unknown software.

  • Mail servers without reverse DNS (i.e. the sending IP address does not resolve to a host name) will be blocked. Mail servers without matching forward and reverse (A and PTR) DNS entries may be blocked.
    • Error Message: 554 Client host rejected: cannot find your hostname, [<IP Address>]
    • Solution: Contact your ISP, mail, or DNS administrator.

  • Level Seven-maintained IP block list of known spam sending mail servers. If the sender's mail server IP address matches this list, email will be denied.
    • Error message: 553 sorry, your mailserver (<IP Address>) is rejected. Your IP or netblock has sent spam to Level Seven.
    • Solution: Contact your ISP or mail administrator. They can then contact Level Seven technical support for more information.

  • Messages from <null> senders will be blocked if sent to more than one recipient.
    • Error message: 550 <address>: Recipient address rejected: Multi-recipient bounce
    • Solution: Read RFC2821 (link opens in a new window). Bounce messages with more than one recipient are not allowed.

  • Improperly formatted or unknown envelope sender email addresses will be blocked.
    • Error message: 504 <address>: Sender address rejected: need fully-qualified address
    • Error message: 504 <address>: Sender address rejected: Domain not found
    • Error message: 501 Bad address syntax
    • Solution: Check your return email address. Contact your mail administrator or hostmaster if the domain you are using does not exist or does not have proper DNS entries.

  • Improperly formatted recipient email addresses will be blocked.
    • Error message: 504 <address>: Recipient address rejected: need fully-qualified address
    • Error message: 501 Bad address syntax
    • Solution: Check the recipient (To:) email address.

  • Unauthorized mail relaying is not allowed
    • Error Message: 554 <email address>: Relay access denied for <hostname>[<IP address]>
    • Solution: Mail should not be sent through http proxies.

  • Last, Level Seven customers may choose to utilize Level Seven Anti-Spam to further block messages that they do not wish to receive. The level of blocking is customized by each user after many different tests are performed on received email.
    • Error message: 553 Spam messages are not being accepted by <recipient's email address> or Spam messages are not being accepted by this account.
    • Solution: Contact the recipient by other means and ask them to add you to their safe list.

DNSBL error messages and suggested resolutions

    Level Seven uses a varied group of publicly available block lists to refuse mail from known spammers, compromised (insecure) computers and servers, dynamically assigned IP addresses (i.e. dialup and ADSL), and certain domains that do not have appropriate DNS entries or contact information. These block lists are used to project our customers from spam and viruses. NOTE: Level Seven utilizes these lists, but does not maintain them. Read the instructions listed at the blocking list's information page. You may need to contact your ISP and have them assist you. Do forward the entire error message to your ISP or mail administrator - it is critical for troubleshooting.

    NJABL Dynablock
    • Error message: 554 sorry, your mailserver (<IP Address>) is rejected using dynablock.njabl.org. See http://www.L7.net/errors.html#dynablock
    • Description: This error message means that your mail server has a dynamic IP address. It is generally accepted that Internet users with a dynamic IP addresses (whether on dial-up, DSL, or cable modem) should be sending email through their ISP's mail server.
    • Solution: Your best course of action is to relay mail through your ISP's mail server, even if you are running your own mail server. If you have a static IP address and are running a mail server, your ISP will need to contact NJABL to update the list.
    • Note: Only the ISP or owner of the IP addresses (ownership according to ARIN records) should contact NJABL for removal. Level Seven Commercial customers should contact Level Seven support if they are incorrectly listed.
    • If you would like to receive more information on this list and what your ISP can do if you feel that you should not be listed, visit NJABL's dynablock (link opens in a new window) page. Please also read additional Level Seven mail server information above.

    NJABL list

    • Error message: 554 Sorry, your mailserver (<IP Address>) is rejected using dnsbl.njabl.org. See http://postmaster.www.L7.net/errors.html#njabl
    • Description: This error message means that your mail server has been listed on the NJABL block list.
    • Solution: Depending on the reason that your IP address is listed, your best course of action could be to relay mail through your ISP's mail server (if it is listed as a dynamic IP address) or secure your computer/server (if the IP is listed for any of the other reasons).
    • Note: Only the ISP or owner of the IP addresses (ownership according to ARIN records) should contact NJABL for removal. Level Seven SDSL and FND customers should contact Level Seven support if they are incorrectly listed.
    • If you would like to receive more information and what your ISP can do if you feel that you should not be listed, visit NJABL (link opens in a new window). Please also read additional Level Seven mail server information above.

    SBL-XBL

    • Error message: 554 Sorry, your mailserver (<IP Address>) is rejected using sbl-xbl.spamhaus.org. See http://www.L7.net/errors.html#sbl-xbl
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam.
    • Solution: Stop sending spam. Contact your ISP or mail administrator for more assistance.
    • Note: Only the ISP or owner of the IP addresses (ownership according to ARIN records) should contact Spamhaus for removal.
    • If you would like to receive more information, visit Spamhaus SBL (link opens in a new window). Please also read additional Level Seven mail server information above.

    DSBL
    • Error message: 554 Sorry, your mailserver (<IP Address>) is rejected using list.dsbl.org. See http://www.L7.net/errors.html#dsbl
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam.
    • Solution: Stop sending spam. Contact your ISP or mail administrator for more assistance.
    • Note: Only the ISP or owner of the IP addresses (ownership according to ARIN records) should contact DSBL for removal.
    • If you would like to receive more information, visit Distributed Server Boycott List (link opens in a new window). Please also read additional Level Seven mail server information above.

    Security | Sage
    • Error message: 554 Sorry, Sender address (<email address>) is rejected using blackhole.securitysage.com. See http://www.L7.net/errors.html#blackhole
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact Security Sage for removal.
    • If you would like to receive more information, visit Security | Sage (link opens in a new window). Please also read additional Level Seven mail server information above.

    RFC Ignorant - DSN
    • Error message: 554 Sorry, Sender address (<email address>) is rejected using dsn.rfc-ignorant.org. See http://www.L7.net/errors.html#dsn
    • Description: Domains are blocked that do not accept valid bounce email.
    • Solution: Contact your ISP or mail administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact RFC Ignorant for removal.
    • If you would like to receive more information, visit RFC Ignorant (link opens in a new window). Please also read additional Level Seven mail server information above.

    RFC Ignorant - Bogus MX
    • Error message: 554 Sorry, Sender address (<email address>) is rejected using bogusmx.rfc-ignorant.org. See http://www.L7.net/errors.html#bogusmx
    • Description: Domains are blocked whose MX (mail exchange) record contains a hostname that points to bogus IP address space (such as that documented in RFC 3330), if the domain contains an MX record which points to an IP address in violation of RFC 1035, or if the domain has MX records containing hostnames that do not have an associated A record.
    • Solution: Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact RFC Ignorant for removal.
    • If you would like to receive more information, visit RFC Ignorant (link opens in a new window). Please also read additional Level Seven mail server information above.

    cbl.abuseat.org
    • Error message: 554 Sorry, Mailserver is rejected using cbl.abuseat.org. See http://www.L7.net/errors.html#cbl.abuseat.org
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact cbl.abuseat.org for removal.
    • If you would like to receive more information, visit cbl.abuseat.org (link opens in a new window). Please also read additional Level Seven mail server information above.

    relays.ordb.org
    • Error message: 554 Sorry, Mailserver is rejected using relays.ordb.org. See http://www.L7.net/errors.html#relays.ordb.org
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact relays.ordb.org for removal.
    • If you would like to receive more information, visit relays.ordb.org (link opens in a new window). Please also read additional Level Seven mail server information above.

    cn-kr.blackholes.us
    • Error message: 554 Sorry, Mailserver is rejected using cn-kr.blackholes.us See http://www.L7.net/errors.html#cn-kr.blackholes.us
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact cn-kr.blackholes.us for removal.
    • If you would like to receive more information, visit cn-kr.blackholes.us (link opens in a new window). Please also read additional Level Seven mail server information above.

    bl.spamcop.net
    • Error message: 554 Sorry, Mailserver is rejected using bl.spamcop.net. See http://www.L7.net/errors.html#bl.spamcop.net
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact bl.spamcop.net for removal.
    • If you would like to receive more information, visit bl.spamcop.net (link opens in a new window). Please also read additional Level Seven mail server information above.

    dnsbl.njabl.org
    • Error message: 554 Sorry, Mailserver is rejected using dnsbl.njabl.org. See http://www.L7.net/errors.html#dnsbl.njabl.org
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Note: Only the ISP, owner of the domain name, or technical/administrative contact for the domain name should contact dnsbl.njabl.org for removal.
    • If you would like to receive more information, visit dnsbl.njabl.org (link opens in a new window). Please also read additional Level Seven mail server information above.

    Level Seven block lists
    • Error message: 554 sorry, <hostname>[<IP address]> - IP has been used to send spam or propagate viruses. See http://.www.L7.net/errors.html#Level_Seven
    • Error message: 554 sorry, <hostname>[<IP address]> - IP or netblock has sent spam to Level Seven. See http://www.L7.net/errors.html#Level_Seven
    • Error message: 554 sorry, <hostname>[<IP address]> - Block listed in SPEWS. See http://www.L7.net/errors.html#Level_Seven
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam. Spam may be sent through your computer/server without your knowledge if it has been compromised by a virus/trojan.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • If you would like to receive more information, visit Distributed Server Boycott List (link opens in a new window). Please also read additional Level Seven mail server information above.

    Level Seven SpamTraps
    • Error message: 554 sorry, <hostname>[<IP address]> - IP or netblock has sent viruses to Level Seven Spamtrap Addresses. See http://www.L7.net/errors.html#SpamTrap
    • Error message: 554 sorry, <hostname>[<IP address]> - IP or netblock has sent spam to Level Seven Spamtrap Addresses. See http://www.L7.net/errors.html#SpamTrap
    • Description: This error message means that the mail server sending mail to the Level Seven mail servers was, and may still be, sending spam or viruses to special addresses we have set up here to catch spammers. Commonly known as a "SpamTrap" these addresses have never been used, and never been published, therefore, anything that gets e mailed to them is, by definition, spam.
    • Solution: Stop sending spam or fix your system so that it is no longer compromised. Contact your ISP, mail administrator, or system administrator for more assistance.
    • Please also read additional Level Seven mail server information above.

    Level Seven Rampant Abuse Blocking
    • Note that we Block The following IP Ranges at the door due to rampant network abuse, :
      • 200.0.0.0/8
      • 211.0.0.0/8
      • 61.0.0.0/8

    • The lack of effort on the part of the administrators of these netblocks to control themselves has shown us, beyond any reasonable arguement, that they are not ready for a global communications medium. We are accepting no e mail from these blocks whatsoever. If you are a responsible network administrator caught in this, contact me and I will whitelist your server. Otherwise, this block will remain until after the heat death of the universe.

    For more information on spam, and how you can do your part in reducing it, visit these sites:
 


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