University of Email by Pankaj Kumar
    Facebook Twitter Instagram
    Facebook Twitter Instagram
    University of Email by Pankaj Kumar
    Subscribe
    • CDP
    • Deliverability
      • Deliverability Issues
      • Email Bounce Error
    • Emarketing
    • Industry updates
    • Solutions
    • About
    University of Email by Pankaj Kumar
    Email Bounce Error

    X.1.8 Email Bounce Error [Bad sender’s system address]

    Pankaj KumarBy Pankaj KumarFebruary 8, 2022Updated:February 8, 2022No Comments2 Mins Read

    4.1.8 Email Bounce Error

    Reason

    Sending Address Is Bad Or Can’t Accept Replies: Delayed Message

    The sending email system either does not exist or cannot accept return email and so email message has not yet been delivered.

    How to fix?

    Review the sender’s email address to identify any misspellings or missing letters in the domain part of the email address. In the settings or options of the sender’s email program, ensure that the sender’s email address is entered correctly. If the problem persists, contact the sender’s email support team to see if they can help troubleshoot further.

    4.1.8 – Official definition from ITEF

    For the code that starts from 4.X.X

    A persistent transient failure is one in which the message as sent is valid, but persistence of some temporary condition has caused abandonment or delay of attempts to send the message. If this code accompanies a delivery failure report, sending in the future may be successful.

    For the code that starts from X.1.8

    The sender's system specified in the address does not exist or is incapable of accepting return mail. For domain names, this means the address portion to the right of the "@" is invalid for mail.

    5.1.8 Email Bounce Error

    Reason

    Sending Address Is Bad Or Can’t Accept Replies: Message Not Delivered

    The message could not be delivered because the sender’s email system either does not exist or cannot accept return email.

    How to fix?

    Review the sender’s email address to identify any misspellings or missing letters in the domain part of the email address. In the settings or options of the sender’s email program, ensure that the sender’s email address is entered correctly. If the problem persists, contact the sender’s email support team to see if they can help troubleshoot further.

    5.1.8 – Official definition from ITEF

    For the code that starts from 5.X.X

    A permanent failure is one which is not likely to be resolved by resending the message in the current form. Some change to the message or the destination must be made for successful delivery.

    For the code that starts from X.1.8

    The sender's system specified in the address does not exist or is incapable of accepting return mail. For domain names, this means the address portion to the right of the "@" is invalid for mail.

    Post Views: 285
    Pankaj Kumar
    • Website
    • Facebook
    • Twitter
    • LinkedIn

    Pankaj Kumar is a senior professional holding 10+ years of experience in CRM, Email Deliverability & Marketing Analytics, Deliverability Onboarding, Implementation, Deliverability Automations He has worked with a broad range of clients to provide strategic, data-driven guidance to increase email delivery, subscriber engagement and revenue. He also helps marketers through this blogs in preparing strategies, data analytics, deliverability, and CRM with a passion for helping email marketers exceed subscriber expectations. You may connect with him on LinkedIn at https://www.linkedin.com/in/kumarpankaj793/

    Related Posts

    X.7.8 Email Bounce Error [User Authentication Failed]

    May 28, 2022

    X.7.7 Email Bounce Error [Message integrity failure]

    May 28, 2022

    X.7.6 Email Bounce Error [Cryptographic algorithm not supported]

    May 28, 2022

    Leave A Reply Cancel Reply

    Subscribe to University of Email

    * indicates required

    Most Viewed Posts
    1. Yahoo/AOL/Verizon Postmaster tool for Email Deliverability (131,979)
    2. What you should ask to your next Email Service Provider? Revealed (125,026)
    3. Transfer your email from Yahoo to Gmail (15,201)
    4. £183m GDPR Fine Levied against British Airways (11,647)
    5. What Should You Know About Email Blacklisting? (9,077)
    Total posts
    • 106posts
    Search UOE
    Things to do here
    • About
    • Questions
      • Activities
      • Ask a question
      • Categories
      • Profile
      • Tags
    Pankaj Kumar
    Pankaj Kumar
    Pankaj Kumar, Author at University of Email
    Facebook Twitter Instagram LinkedIn
    © 2025 University of Email. Designed by BirdServer Technologies.

    Type above and press Enter to search. Press Esc to cancel.

    Please wait...

    Subscribe to our newsletter

    Want to be notified when our article is published? Enter your email address and name below to be the first to know.
    SIGN UP FOR NEWSLETTER NOW