Have you ever faced a problem with SMTP error 554.5.7.1? Usually, people used to face while sending the mail from the exchange server to domain user who are permitted externally. At this time, they face the SMTP problem “you are not allowed to connect”. Simply, it shows the error message in non-delivery receipt!

What is the reason behind the SMTP error?

There may be many possible reasons behind the SMTP error which is predictable and can be ensured before submitting the mail. Inefficient submissions, authentication gets failed and fails to get permission are the major reasons. Once if the mail has been identified as spam and so, it makes the IP as the real-time blacklist. If you add the domain in blacklist mode of recipient. If the sender of the mail has a negative impact in reviews and then it automatically rejects the mail. If the sender has improper hostname and it doesn’t configure properly then the sender has the problem in DNS.

Sometimes, HES (Hosted email security) found in the management of directories may inflict the filters using the LDAP directories. It sincerely configures the sender mail ID whether it is valid or not.

Can anyone predict which is the ultimate cause of SMTP error?

Absolutely! The main issues were identified as the spam emails. If the sender sends the bulk of emails in name as email marketing and if the virus is sent along with the emails.

How it will show the error messages and what are the conditions?
  • 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
  • 554 5.7.1: Delivery not authorized
  • 554 5.7.1: You are not allowed to connect
  • 554 5.7.1: Client host rejected: Access denied
  • 554 5.7.1: Service unavailable; Client host X.X.X.X blocked
  • 554 5.7.1: Relay access denied
  • 554 5.7.1: Recipient address rejected: Access denied.
What are the ways to get rid out of SMTP error?

Step 1: Firstly, you should have a guess point to check whether the FROM and RECIPIENT of the mail address is valid or not.

Step 2: You can download any spam detecting software to check the virus entry point.

Step 3: Thirdly, you must follow the guidelines of anti-spam policy and so, kindly check you were logged in DNS signature.

Step 4: Use blacklist tools to check the sender mail is in blacklist or not?

Step 5: If you unconsciously added the sender mail ID in blacklist then you can remove it. But if you added frequently then you cannot remove it easily!

Step 6: Use SMTP service to ensure your configuration details. If you fails to do the configuration then the SMTP service will take care!
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