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SMTP Error 554 5.7.1

When sending email, it may fail with one of these error codes reported by the server:

554 5.7.1 : Client host rejected: Access denied
554 5.7.1 : Service unavailable; Client host X.X.X.X blocked using zen.spamhaus.org
554 5.7.1 : Relay access denied
554 5.7.1 : Your mail server X.X.X.X is listed at www.spamhaus.org
554 5.7.1 : Recipient address rejected: Access denied
554 5.7.1 : Message cannot be accepted, rules rejection
554 5.7.1 : Message refused by Dictionary check
554 5.7.1 : Relay Access Denied for One Domain
554 5.7.1 : <user@domain.com>: Recipient address rejected: user user@domain.com does not exist
554 5.7.1 : Message cannot be accepted, spam rejection
554 5.7.1 : Message refused by DNSBL check
554 5.7.1 : Sender address rejected: Access denied
554 5.7.1 : <user@domain.com>: Sender address rejected: Blocked by this domain
554 5.7.1 : <user@domain.com>: Sender address rejected: Blocked by this recipient
554 5.7.1 : Your server X.X.X.X is listed by the blacklist dul.dnsbl.sorbs.net. Please contact your Dial-Up/DSL/Network ISP Provider.
554 5.7.1 : The message from (<foo@example.com>) with the subject of (...) matches a profile the Internet community may consider spam. Please revise your message before resending.
554 5.7.1 : Message blocked due to spam content in the message
554 5.7.1 : You are not allowed to connect
554 5.7.1 : <servername[X.X.X.X]>: Client host rejected: The sender's mail server is blocked
554 5.7.1 : Service unavailable. Client host [X.X.X.X] blocked using SIP invaluement local
554 5.7.1 : Email cannot be delivered. Reason: Email detected as Spam by spam filters.
554 5.7.1 : [MW01] Message content not accepted for policy reasons
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.26.0.2 Cloudmark CSI. Please visit http://csi.cloudmark.com/reset-request for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.22.0.2 Senderscore. Please visit https://senderscore.org/rtbl/ for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.24.0.2 Spamhaus XBL. Please visit http://www.spamhaus.org/lookup/ for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.5.0.X Spamcop. Please visit http://spamcop.net/bl.shtml for more information on why this message could not be delivered

Causes

The general meaning of 554 5.7.1 is that your email is "not allowed".  This is, of course, insufficiently specific.  Look closely at the error message to narrow it down.

Sender Not Authorized

If the error mentions "Relay denied" or "Access denied", this indicates that you are not allowed to send email through the mail server.  Here are some examples:

554 5.7.1 : Client host rejected: Access denied
554 5.7.1 : Relay access denied
554 5.7.1 : Recipient address rejected: Access denied
554 5.7.1 : Relay Access Denied for One Domain
554 5.7.1 : Sender address rejected: Access denied


Make sure that your mailing program is configured to authenticate with a user name and password.  It might also help to use the same email address for the Sender and the authentication user name.  We have an entire article dedicated to this topic here.


Spam Filter

The server may be rejecting the content of the email, thinking that it looks like spam.  Here are some examples:

554 5.7.1 : Message cannot be accepted, rules rejection
554 5.7.1 : Message cannot be accepted, spam rejection
554 5.7.1 : Message refused by Dictionary check
554 5.7.1 : Message blocked due to spam content in the message
554 5.7.1 : The message from (<foo@example.com>) with the subject of (...) matches a profile the Internet community may consider spam. Please revise your message before resending.
554 5.7.1 : Email cannot be delivered. Reason: Email detected as Spam by spam filters.
554 5.7.1 : [MW01] Message content not accepted for policy reasons


Clean up the body and subject of the email to make it look less "spammy", and try again.  We have an entire article dedicated to this topic here.


Blacklisting

It is possible that your IP address, or the IP address of your relaying SMTP server, has become blacklisted.  Here are some examples:

554 5.7.1 : Message refused by DNSBL check
554 5.7.1 : Your mail server X.X.X.X is listed at www.spamhaus.org
550 5.7.1 : [RBL] Sender blocked <IP or domain> error
554 5.7.1 : <user@domain.com>: Sender address rejected: Blocked by this domain
554 5.7.1 : <user@domain.com>: Sender address rejected: Blocked by this recipient
554 5.7.1 : <servername[X.X.X.X]>: Client host rejected: The sender's mail server is blocked
554 5.7.1 : Service unavailable. Client host [X.X.X.X] blocked using SIP invaluement local
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.26.0.2 Cloudmark CSI. Please visit http://csi.cloudmark.com/reset-request for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.22.0.2 Senderscore. Please visit https://senderscore.org/rtbl/ for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.24.0.2 Spamhaus XBL. Please visit http://www.spamhaus.org/lookup/ for more information on why this message could not be delivered
554 5.7.1 : ACL dns_rbl; Client host [X.X.X.X] blocked using sa-ip4tset.blagr.emailsrvr.com=127.5.0.X Spamcop. Please visit http://spamcop.net/bl.shtml for more information on why this message could not be delivered


Determine which services have you blacklisted.  There is a tool for this here.  If neither your personal computer nor mail server is on one of these public blacklists, then it must be an internal blacklist.  Contact the company through their website or by phone.  This topic is also discussed in more detail here.


Direct Delivery not allowed from dynamic IP address

You will get an error if you try to deliver an email directly to the recipient's mail server from an IP address that is assigned dynamically, as opposed to a static IP address which are assigned to web servers.  Here are some examples:

554 5.7.1 : You are not allowed to connect
554 5.7.1 : Service unavailable; Client host X.X.X.X blocked using zen.spamhaus.org
554 5.7.1 : Your server X.X.X.X is listed by the blacklist dul.dnsbl.sorbs.net. Please contact your Dial-Up/DSL/Network ISP Provider.


The only solution to this problem is to relay the email through an intermediate SMTP server which is assigned a static IP address.  We have an entire article dedicated to this topic here.

Bad Email Address

If you are trying to send an email to a mail account that doesn't exist, the 554 error can occur.  Here is an example:

554 5.7.1 : <user@domain.com>: Recipient address rejected: user user@domain.com does not exist


Maybe the email address was closed by the owner, or taken away from them, or never existed at all.  Unlike a 4xx error code, 5xx indicates it is permanent and not just a temporary suspension.  You should remove it from your mailing list.