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SMTP Email Error 446, 447, 449 - How to Resolve [SOLVED]

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    The basic foundation for sending emails over the internet is called Simple Mail Transfer Protocol, or SMTP. Email servers send, receive, and relay outgoing mails between senders and recipients using this standard protocol. This method not only guarantees that your emails go to the people you want them to, but it also takes care of any mistakes that could happen during the email transmission.

    Still, SMTP problems might sabotage this smooth communication. These mistakes might range greatly and each one points to a particular problem that has made it impossible to transmit an email. SMTP mistakes have a big impact on email deliverability; they can cause annoyance, lost messages, and delayed communications for both users and organizations. Anyone depending on email for important conversations must understand the subtleties of these problems, especially SMTP Email problems 446, 447, and 449. By enabling prompt diagnosis of problems and returning email systems to normal operation, this knowledge guarantees effective and dependable email exchanges.

    What are SMTP email errors 446, 447, 449

    SMTP email errors 446, 447, and 449 are particular problems that can impede email delivery that is intended to be successful. Every error code gives information on many kinds of issues with the email transmission.

    SMTP Email Error 446

    Error 446 indicates that the email sending was delayed and not yet delivered, due to issues on the receiving server or a network routing problem. The server is temporarily unable to deliver your message but will keep trying.

    Users will typically see a message stating,

    “The message was delayed but will continue to be retried,”


    “Delivery of your email is being delayed.”

    SMTP Email Error 447

    This error occurs when the sender sends an email, but it fails to be delivered within the expected time frame. This is often due to the email being sent to a server that was unable to process it quickly enough, possibly because of heavy traffic or server performance issues.

    The user might receive a notification like,

    “Your message could not be delivered within the specified time,”


    “Delivery timeout reached, message not delivered.”

    SMTP Email Error 449

    Error 449 is typically thrown when the request to send an email cannot be processed because of a routing issue within the server network, often influenced by policy reasons or server configurations that redirect the request.

    The error message could read,

    “The requested action cannot be taken due to a routing error,”


    “Routing error, message not sent.”

    Error 446, 447, 449 in SMTP Email Common Causes

    SMTP Email Error 446: Queued Mail for Delivery

    • Network Congestion or Instability. If the network connecting to the recipient’s server is experiencing high traffic or instability, emails may be delayed, triggering Error 446.
    • Server Overload. The recipient’s server may be temporarily overloaded with requests, unable to process new emails promptly, causing delays in email delivery.
    • Temporary Connectivity Issues. Temporary loss of connectivity due to maintenance or network errors can also lead to emails being queued rather than delivered immediately.

    SMTP Email Error 447: Timeout Exceeded

    • Server Timeouts. This error often occurs when the recipient server cannot process the email quickly enough, possibly due to server performance issues or high volumes of email traffic.
    • Large Email Attachments. Sending emails with large attachments can slow down the delivery process, exceeding the server’s timeout limit, especially if the server or network has bandwidth limitations.
    • Resource Limitations. Inadequate server resources, such as memory or processing power, can lead to longer processing times, resulting in timeouts.

    SMTP Email Error 449: Routing Error

    • Misconfigured Routing Tables. Incorrectly configured routing tables in the email transmission path can misdirect emails, leading to routing errors.
    • Policy Restrictions. Certain server policies or configurations intended to manage traffic and secure the server might block or reroute emails unexpectedly, causing Error 449.
    • DNS Issues. Problems with Domain Name System (DNS) resolution, which affects how email addresses are translated into server IP addresses, can also result in routing errors.

    Step-by-step solutions to resolve SMTP email error 446, 447, 449

    SMTP Email Error 446 (Queued Mail for Delivery)

    1. Initial Wait and Retry. Often, SMTP Error 446 resolves on its own as the email server retries the delivery. Wait a few hours, then attempt to resend your email.

    2. Network Diagnostics. Run network diagnostics to check the stability and speed of your connection. Tools like ping and traceroute can help identify network latency or instability. Use commands like:

      • ping yourmailserver.com
      • traceroute yourmailserver.com
    3. Email Server Status Check. Visit the status page of your email provider (Gmail, Outlook, Yahoo) to see if there are any alerts about server downtime or maintenance that could be affecting email delivery.

    SMTP Email Error 447 (Timeout Exceeded)

    1. Compress Attachments. Before sending large files, compress them using tools like WinRAR or 7-Zip, or use cloud services like Google Drive or Dropbox and send a link instead.

    2. Adjust Client Timeout Settings:

      • Outlook: Go to File > Account Settings > Account Settings > Double click on your account > More Settings > Advanced and increase the server timeout slider.
      • Other Clients: Look for similar settings in your email client’s advanced settings menu.
    3. Contact ISP. If the problem persists, contact your Internet Service Provider to inquire about possible bandwidth or service issues that could be impacting your email sending capabilities.

    SMTP Email Error 449 (Routing Error)

    1. Verify Recipient Email Address: Double-check the recipient’s email address for any errors. Incorrect or misspelled email addresses are a common cause of routing errors.

    2. DNS Configuration Check: Use DNS lookup tools like MXToolbox to check your domain’s MX records and ensure they are correctly pointing to your email server.

      • Access MXToolbox
      • Enter your domain and select MX Lookup to verify your MX records.
    3. Consult Network Administrator: If you manage an internal or private email server, consult with your network administrator to examine the SMTP routing configurations. Ensure there are no misconfigurations or restrictive policies that could be causing the emails to fail.

    Utilizing email warm-up services

    email warm up

    Using a specialist service like Warmy.io can be quite beneficial for handling recurrent SMTP email issues like 446, 447, and 449. These services are made to solve typical problems that cause SMTP errors, therefore increasing the dependability and efficiency of email systems.


    Enhancing Email Deliverability with Warmy.io

    spam test
    • Email Warm-Up. Warmy.io’s email warm-up feature automatically sends out a number of emails that gradually increases over time, helping to build a positive sender reputation with ISPs. This is particularly helpful for new email accounts or after changes to email infrastructure.

    • Blacklist Monitoring. Warmy.io monitors various blacklists to ensure that your email domain or IP isn’t listed. Being on a blacklist can drastically affect your deliverability and is often a hidden cause of repeated SMTP errors. Use a free email deliverability test to see any blacklists your domain may be on.

    • Email Authentication Tools, Warmy.io provides tools to generate and manage essential email authentication records like SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting, and Conformance). Proper configuration of these records is crucial for preventing email spoofing and ensuring emails are not rejected by recipient servers.

    • DNS Test, Additionally, Warmy.io includes a DNS test in the admin panel, allowing users to quickly verify that their domain’s DNS settings are correctly configured for optimal email delivery. This feature helps diagnose issues that could lead to routing errors (SMTP Error 449).

    Consulting with an Email Deliverability Consultant


    Consulting with an email deliverability consultant through Warmy.io can provide tailored advice for complex issues and strategic guidance to enhance your overall email system performance. These experts can help troubleshoot persistent SMTP errors, refine your email strategy, and ensure that your email setup is optimized to reduce the likelihood of delivery issues.


    Critical business relationships as well as workflow efficiency can be seriously hampered by SMTP errors like 446, 447, and 449. Emails must be promptly resolved to reach their intended recipients in order to preserve the professionalism and dependability that are anticipated in digital communication.

    Using professional tools and consulting services like Warmy.io is strongly recommended to enhance the health and efficiency of your email systems. Warmy.io provides a robust set of features designed to improve email deliverability, including email warm-up processes, blacklist monitoring, and essential email authentication tools such as SPF and DMARC record generators.

    In summary, for any organization relying on email as a crucial communication tool, investing in a service like Warmy.io is a wise decision. It not only helps in troubleshooting and resolving current SMTP errors but also plays a crucial role in preventing future issues, ensuring that your email system operates smoothly and efficiently at all times.

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