Summary
The Vade Secure OXSUS0001_403 error code indicates a problem with email delivery, primarily due to a non-existent user or an invalid email address format. The error has two definitions, one for bulk mail (non-existent user, treat as unsubscribe) and one for non-bulk mail (format error). When sending to Earthlink, it may be due to Vade Secure filtering. Regularly clean and validate email lists, implement double opt-in, monitor sender reputation, and review email content for compliance. The error indicates a 4xx permanent failure which the sender needs to solve. Remove the address from future mailings and partner with email providers for further resolution.
Key findings
- Dual Meaning: The OXSUS0001_403 error code signifies either a non-existent user or an invalid recipient address format.
- Bulk vs. Non-Bulk Treatment: Bulk mailers should treat this error as a hard bounce and unsubscribe, while others should verify address format.
- Impact on Reputation: Frequent occurrence indicates issues with list hygiene and can negatively impact sender reputation, deliverability.
- Earthlink Connection: The error might be associated with Vade Secure filtering for Earthlink addresses, suggesting checking sender reputation.
- 4xx Error: OXSUS0001_403 being in the 400s implies the error needs to be addressed by the sender.
Key considerations
- List Maintenance: Implement ongoing list hygiene practices: cleaning, validation, signup verification (double opt-in).
- Reputation Management: Monitor and maintain a positive sender reputation to avoid being flagged as spam by Vade Secure and others.
- Content Compliance: Review email content and sending practices to comply with anti-spam regulations.
- Error Suppression: Treat the OXSUS0001_403 as a hard bounce: suppress the email address from future sends.
- Provider Collaboration: Work with your email service provider to understand root cause and resolve the issue.
What email marketers say
9 marketer opinions
The Vade Secure OXSUS0001_403 error code indicates issues with email delivery, stemming from either a non-existent user, an invalid email address format, or potential filtering by Vade Secure. The error has two definitions. For bulk mailers it usually relates to a non-existent user and should be treated as an unsubscribe. For non-bulk mail, it indicates a format error. Resolving it involves cleaning email lists, verifying email addresses, ensuring compliance with email best practices, and monitoring sender reputation. If Earthlink is involved it may require an unsubscribe.
Key opinions
- Two Definitions: Vade Secure's OXSUS0001_403 error has two potential meanings: a non-existent user or an invalid recipient address format.
- Bulk vs. Non-Bulk: For bulk mail, the error typically means the user doesn't exist and should be treated as an unsubscribe. For non-bulk mail, the error indicates a format issue.
- Earthlink Specifics: When sending to Earthlink addresses, this error may indicate Vade Secure filtering, requiring attention to sender reputation and list hygiene.
- Impact on Reputation: Frequent occurrences of this error can negatively affect sender reputation, leading to deliverability problems.
- Root Cause: The underlying cause may be Vade Secure identifying the sender as a potential source of spam or malicious content.
Key considerations
- List Hygiene: Regularly clean and validate your email lists to remove invalid or inactive addresses, reducing bounce rates.
- Sender Reputation: Monitor your sender reputation and ensure your email practices align with best practices to avoid being flagged as spam.
- Content Review: Review your email content and sending practices to ensure they comply with anti-spam regulations.
- Double Opt-In: Implement a double opt-in process to ensure the validity of email addresses collected.
- Error Handling: Treat the OXSUS0001_403 error as a hard bounce and suppress the address from future mailings, especially if it relates to Earthlink addresses.
Marketer view
Email marketer from Email Geeks shares Vade Secure's response stating that the OXSEU0001_403 error indicates an invalid email address (non-existent user). They recommend that bulk mailers treat it as a hard bounce and remove the address from their database. If the sender is not a bulk mailer, the issue is the same: the email address is wrong.
5 Jan 2025 - Email Geeks
Marketer view
Email marketer from Email Geeks shares the two definitions listed on Vade Secure's postmaster page for the OXSUS0001_403 error code. The first definition relates to an invalid recipient address format, and the second indicates a non-existent user, which should be treated as an unsubscribe for bulk mailers.
31 Jul 2024 - Email Geeks
What the experts say
2 expert opinions
Encountering the Vade Secure OXSUS0001_403 error suggests issues with email list hygiene that can be addressed by the sender. A key approach to minimizing these errors is validating email addresses at signup and consistently cleaning existing lists. Since it's a 4xx error, the sending party has to work with their provider to address the cause of the invalid address and suppress it from future mailings.
Key opinions
- List Hygiene Indicator: Frequent OXSUS0001_403 errors point to problems with the cleanliness and validity of your email list.
- Sender-Solvable Issue: As a 4xx-level error, the sender has the responsibility and ability to resolve the underlying cause.
Key considerations
- Signup Validation: Implement methods for validating email addresses at the point of signup to ensure accuracy from the beginning.
- Regular Cleaning: Establish a routine for regularly cleaning your email lists to remove invalid or inactive addresses.
- Partner with Provider: Work with your email service provider to understand the specific reasons for the errors and implement solutions.
- Suppression: Suppress users who generate the OXSUS0001_403 error from future mailings to protect your sender reputation.
Expert view
Expert from Spam Resource explains that seeing the OXSUS0001_403 error regularly indicates issues with list hygiene. It suggests employing methods for validating addresses at the point of signup and regularly cleaning your existing lists to minimize these bounces.
27 Sep 2022 - Spam Resource
Expert view
Expert from Word to the Wise suggests that 400-level errors are issues which the sender can solve, while 500-level errors require the receiver to solve. So if a bounce has 403 it is an error you can fix, by addressing why the address may be invalid. She suggests working with your provider to fix the errors and suppress the users.
15 Mar 2024 - Word to the Wise
What the documentation says
4 technical articles
The Vade Secure OXSUS0001_403 error signals a permanent email delivery failure due to either a non-existent recipient or an invalid email address format. Vade Secure's documentation indicates two possible interpretations of the code. For bulk mailers, a non-existent user should be treated as an unsubscribe. Regardless of the specific reason, the best practice is to treat addresses returning this error as invalid, remove them from your mailing list, and avoid resending emails to them.
Key findings
- Two Error Types: OXSUS0001_403 indicates either a non-existent user or an invalid email address format.
- Non-Standard Code: While not a standard SMTP error code, OXSUS0001_403 signifies a permanent failure.
- Permanent Failure: The error should be treated as a permanent failure (similar to a 5xx SMTP error).
Key considerations
- List Removal: Remove email addresses that generate this error from your mailing list.
- No Resending: Do not attempt to resend emails to recipients who have returned this error.
- Unsubscribe (Bulk): For bulk mailers, treat non-existent users as unsubscribes.
Technical article
Documentation from ietf.org shares 5xx errors signify a permanent failure. Though OXSUS0001_403 is not a standard SMTP response, if a receiving server returns such an error for a non-existent user or an invalid address format, the sending server should not attempt to resend the message to that recipient.
4 Feb 2022 - ietf.org
Technical article
Documentation from Vade Secure explains that the OXSUS0001_403 error can mean two things: either the email was sent to a non-existent customer/user or the format of the recipient's address is invalid. The first case should be treated as an unsubscribe if the sender is a bulk mailer.
21 Jun 2021 - Vade Secure
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