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Summary

The 554 delivery error from Verizon and related domains (like bellatlantic.net and gte.net) often indicates a permanent failure in email delivery. While these errors can stem from various causes, a notable incident involved a specific issue with Verizon's internal systems related to the RRVS (Recipient Related Verification Service) header parsing. This led to improper rejections of legitimate emails, even for mailboxes with recent engagement. It's crucial for senders to understand that unlike temporary errors, a 554 bounce requires investigation into underlying issues such as recipient validity, sender reputation, or technical misconfigurations.

What email marketers say

Email marketers frequently encounter 554 delivery errors, especially when dealing with major ISPs like Verizon and its associated domains. Their experiences highlight the diverse nature of these errors, ranging from straightforward invalid addresses to more nuanced issues related to sender reputation and ISP-specific filtering rules. Many marketers focus on immediate troubleshooting steps, such as checking their sending metrics and list hygiene, while also acknowledging the often opaque nature of some ISP rejections.

Marketer view

Email marketer from Email Geeks observes a significant increase in "554 delivery error: [email] is no longer valid. [-20]" messages coming specifically from verizon.net. This sudden surge is concerning, especially because many of the affected mailboxes have shown recent engagement, which typically indicates active users.The pattern suggests something more than simple inactivity or a typical mailbox purge. The marketer is actively troubleshooting the issue with Verizon to understand the root cause, suspecting a systemic problem rather than individual recipient issues.

02 Oct 2019 - Email Geeks

Marketer view

A marketer from Knowledge Base - ScalaHosting suggests that an SMTP Error 554 can arise from various factors, including invalid recipient addresses, which is a common cause for email bounces. They emphasize the importance of verifying recipient email addresses to prevent such errors.Furthermore, they point out that a blacklisted IP address or poor DNS records can also trigger this error. This highlights the need for senders to maintain good IP reputation and ensure their DNS configurations are correct to avoid email rejections.

15 Mar 2023 - Knowledge Base - ScalaHosting

What the experts say

Experts in email deliverability offer nuanced insights into 554 errors, particularly when they originate from major providers like Verizon. Their perspectives often delve beyond basic causes, highlighting technical complexities and the evolving nature of ISP filtering. They stress the importance of understanding the specific context of the error message, the role of authentication, and the potential for temporary system glitches at the recipient's end.

Expert view

Expert from Email Geeks indicates that Verizon addresses are typically paid addresses. When a subscriber ceases their payments to Verizon, these email addresses are generally deactivated and will no longer be valid.This clarifies why an address that previously showed engagement might suddenly become invalid, resulting in a 554 error. It's not necessarily a technical fault in the sending process but rather a natural consequence of account termination.

03 Oct 2019 - Email Geeks

Expert view

An expert from Word to the Wise confirms observing false 550 (similar to 554 in result) responses from Verizon. They identified the specific error message, "554 delivery error: [email] is no longer valid," as being related to an uptick in user unknown responses for Verizon email addresses.Their analysis indicates that this issue began around September 23-24, impacting verizon.net, gte.net, and bellatlantic.net, but notably not yahoo, aol, or rocketmail domains, suggesting a localized problem within Verizon's legacy infrastructure.

04 Oct 2019 - Word to the Wise

What the documentation says

Official and technical documentation often provides the foundational understanding of SMTP error codes like 554, outlining general causes such as permanent failures due to invalid recipients or policy violations. While specific incidents like Verizon's RRVS bug are typically addressed in support forums or direct communications, broader documentation covers common reasons for rejection, including sender reputation, content analysis, and DNS configurations. This type of information is crucial for understanding the underlying mechanisms of email deliverability.

Technical article

Documentation from ScalaHosting's Knowledge Base outlines that SMTP Error 554 often indicates a permanent failure for various reasons. These include invalid recipient addresses, which signifies the email address simply does not exist or is no longer active.Additionally, they note that a blacklisted IP address or incorrect DNS records on the sender's side can also be a direct cause. This points to the importance of both list hygiene and proper technical configuration for successful email delivery.

15 Mar 2023 - Knowledge Base - ScalaHosting

Technical article

Documentation from Forward Email's FAQ section states that if there are any arbitrary results from Spam Scanner, the email is rejected with a 554 error code. They specify that, at the time, arbitrary results included the GTUBE (Generic Test for Unsolicited Bulk Email) test.This highlights that certain content patterns, even if part of a test, can trigger immediate and permanent rejections from mail systems, emphasizing the strictness of some spam filters.

01 Jan 2024 - Forward Email

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