While sending an email, you should take into account 2 mailing servers: yours one and the recipient’s.

Email sending process

As you can see, your email can be rejected either by your mail server, as a sender’s, or your recipient’s server. 

Reasons of a 554 5.7.1 SMTP error

  • Your IP as a sender’s can be somewhere blacklisted by spam filters due to spam-like content. You can use special resources to find out whether you’re on a blacklist or not;
  • You can be in a personal blacklist of a recipient, as a source of spam, because of different reasons and it’s really difficult to get to know them;
  • Before sending an email, you haven’t properly authenticated your mail server for the recipient’s mail server to know that you are a reliable source, but not a spammer.
  • You may have failed security checks. Perhaps, a recipient has his own anti-spam policy and you haven’t managed to follow it.

How to avoid a 554 5.7.1 SMTP error

  • Make sure that “From” and “Recipient addresses are correct”;
  • Install special software to check for spam and be sure that there are no viruses;
  • Check the server authentication configurations, especially in case it was updated. Probably you’ll have to change settings manually;
  • Follow the anti-spam policy of your mail server;
  • Recipients can have their own anti-spam rules and you may discuss with them one of them to be disabled;
  • If you send a large number of emails, use a third party — SMTP service, since it will make you free from the restrictions on the number of emails sent and increase the delivery speed.

To be sure that you’re not blacklisted, use these tools:

  • MX Toolbox blacklist check
  • DNSBL blacklist check

In case you were mistakenly added to a blacklist, you can be removed with the help of the removal form.

The most common 554 5.7.1 messages

  • 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 : 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 : Message cannot be accepted, spam rejection
  • 554 5.7.1 : Message refused by DNSBL check
  • 554 5.7.1 : Sender address rejected: Access denied
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