Fix SMTP Error 553 Postfix

Fix SMTP Error 553 Postfix

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    It appears that some users have encountered a known Postfix SMTP error code 553. There are a number of factors that can cause this problem. We’ll cover them below. You are trying to forward emails through this server, but you have not been authenticated. Users are most likely seeing this message because not everyone is authenticated. Your internet mail client must connect before you can send emails.

    A few days ago, my email in Outlook initially had problems. I was able to send emails without any problem, usually there was a problem receiving the email. People told me they sentMy emails will bounce off the inflatable boat and give them the error “Mail was not delivered: return message to sender.” During my self-test, it turned out that unfortunately some emails were successfully received through my email client, but many were re-sent with your SMTP 553 error. In this article, I will show you what I tried and what ultimately worked , many made me fix it.

    smtp error 553 postfix

    The targets of the errors in returned emails were affected by Fwd: Mailing failed: Returning to the sender of the message, so they contained the following error:

    SMTP error from remote mail server after RCPT TO:
    553 Sorry, this domain is not on my rcpthosts allowed list (# 5.7.1)

    Possible Solutions

    smtp error 553 postfix

    If you search the Internet for answers, it seems like this happens when a large mail server refuses to act as a relay. I found some pointers on how to fix this advice error. Unfortunately, these were suggestions for people who received the error message SMTP 553 when sending email. They had no problem with email. In my case, I was sending emails without issue, receiving emails was not working as expected. If you’re having the same problem because of me, skip to the next specific section.

    If you receive a 553 error rejection message when sending your email, try one of the following suggestions. You can find step-by-step instructions on how to make changes in Microsoft Outlook 2013 in this AuthSMTP article.

    • An authentication option is required to enable SMTP
      Since a number of mail servers require authentication, an error may occur if the sender of the email has disabled SMTP authentication. This is discussed in the authsmtp article for step 6.
    • Set SMTP port from twenty to 587
      The AuthSMTP article usually shows this in step 7.
    • Toggle SPA (Secure Password Verification)
      In the AuthSMTP article, you can find this selection in the change window account shown in method 4.

    If none of the above solutions worked for you and you still have problemsbut with simply sending letters to a specific place (the part of the letter after the @), most likely the problem is at the end of the recipient.

    Contact The Host

    Since this did not help find a solution on the internet, I decided to contact support for several other hosts. In the end, it turned out that they were the problem. The hosting provider simulated my domains on the new device, but the configuration was not set correctly, so some emails were simply redirected to the old computer on the Internet. Since my domain was deleted on the old server, the email was returned to the sender with SMTP error 553. This makes sense because some mail managers use error 553 when the user doesn’t exist.


    When troubleshooting SMTP email error 553, most Internet related suggestions focus on what the sender receiving the error should deliver. They are listed in this document, but the error could also be caused by the way the recipient was terminated, as was the case here. As found outWell, the problem was not with my client’s current Microsoft Outlook, but with the provider of my website. The issue was resolved by contacting them about this error.

    How did you solve the problem with disabling SMTP 553? this comment and let us know. If you found this article helpful, be sure to share it on social media.

    Why Do I Need To Fill In The CAPTCHA?

    How do I fix Error 553?

    Special “Account Settings” from the “Tools” menuAfter selecting your email account from the list, click the current Change button and enter the server concept in the Outgoing Mail Server (SMTP) field.

    Completing the main CAPTCHA proves that you are human and gives you temporary access to the web resource.

    What Can I Do To Prevent This From Happening Again In The Future?

    If your business has a private connection like you do at home, you can run a good virus scan on your device to make sure it’s not corrupted by malware.

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  • If you have a very large office or a shared network, you will most likely ask your network administrator to run a network scan that will show up for misconfigured or infected devices.

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    What does code 553 mean?

    Typically, email error 553 is due to not using SMTP certification. Most email computers require you to authenticate with a trusted user who is valid on the system. You can forward a remote desktop help message in advance.

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