Main Menu
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • English English English en
  • BLOG
  • CONTACT SALES
  • FREE TRIALS
  • English English English en
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • Menu

Email Security: How to troubleshoot NDR's.

03/26/2020 1,034 People found this article helpful 195,453 Views

    Download
    Print
    Share
    • LinkedIn
    • Twitter
    • Facebook
    • Email
    • Copy URL The link has been copied to clipboard

    Description

    I do not receive NDR's, How can I see what message was rejected?

    Resolution

    In Email Security go to the Manage | Server | Advanced | Download System/Log Files | pmta:mta-log  and download the MTA hourly log for the time the original message was sent.

    Keep in mind that these are logged in GMT so you will need to add hours according to the time zone you are in.

    Listed below is the general ESMTP response codes you may see listed in an SMTP conversation.

    ESMTP STATUS CODE

    DESCRIPTION

    211

    System status, or system help reply

    214

    Help message
    (Information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user)

    220

    Service ready

    221

    Service closing transmission channel

    250

    Requested mail action okay, completed

    251

    User not local; will forward to

    354

    Start mail input; end with "."

    421

    Service not available, closing transmission channel
    (This may be a reply to any command if the service knows it must shut down)

    450

    Requested mail action not taken: mailbox unavailable
    (E.g., mailbox busy)

    451

    Requested action aborted: local error in processing

    452

    Requested action not taken: insufficient system storage

    500

    Syntax error, command unrecognized
    (This may include errors such as command line too long)

    501

    Syntax error in parameters or arguments

    502

    Command not implemented

    503

    Bad sequence of commands

    504

    Command parameter not implemented

    550

    Requested action not taken: mailbox unavailable
    (E.g., mailbox not found, no access)

    551

    User not local; please try <....>

    552

    Requested mail action aborted: exceeded storage allocation

    553

    Requested action not taken: mailbox name not allowed
    (E.g., mailbox syntax incorrect)

    554

    Transaction failed

     

    For specific codes for Microsoft Exchange please see their KB: http://support.microsoft.com/kb/284204

    There are also many other documents in the Microsoft KB depending on the NDR you are seeing.

    • Depending on the type of Email Server you use and the type of server your sending to , you may see different messages.
    • However the numbered code will always be the same on an NDR.
    • BATV (Bounce Address Tag Validation) can also cause issue with not recieving an NDR and Out of Office replies
    • BATV will drop an NDR or Out of Office reply if the mail from address is a NULL value.

      NOTE: Exchange settings prevent an NDR or a Out of Office reply from using the original recipients email address in the mail from field and will alter to a NULL value if it is destined for outside of the local network.

    • The only fix for this and to be able to get NDR's or Out of Office replies would be to either alter the default behavior of the Email Server or to turn off BATV.
    • If BATV is turned off and you still do not get any NDR's or Out of office replies then it may be possible that an internal MX and A record does not exist on your internal DNS server for your own domain.
    • The MTA does MX record routing, so when an NDR is generated by the local outbound MTA to the original sender the MX lookup returns the public IP address to route to.
    • Depending on firewall settings these will not be returned to the internal email server unless a local record exists to point to the internal email server or a look back policy is set in the firewall to direct the SMTP traffic destined for the public IP of the MX record back to the internal mail server private IP address.

    Related Articles

    • Network Security Essentials eLearning Training Course
    • How do I check if syslogs are getting forwarded by an Email Security Appliance?
    • How to add inbound path in Hosted Email Security

    Categories

    • Email Security > Email Security Appliance
    • Email Security > Email Security Software
    • Email Security > Hosted Email Security

    Not Finding Your Answers?

    ASK THE COMMUNITY

    Was This Article Helpful?

    YESNO

    Article Helpful Form

    Article Not Helpful Form

    Company
    • Careers
    • News
    • Leadership
    • Awards
    • Press Kit
    • Contact Us
    Popular resources
    • Communities
    • Blog
    • SonicWall Capture Labs

    Stay In Touch

    • By submitting this form, you agree to our Terms of Use and acknowledge our Privacy Statement. You can unsubscribe at any time from the Preference Center.
    • This field is for validation purposes and should be left unchanged.
    • Facebook
    • Twitter
    • Linkedin
    • Youtube
    • Instagram

    © 2023 SonicWall. All Rights Reserved.

    • Legal
    • Privacy
    • English
    Scroll to top