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What are the best practices for email address validation and avoiding spam traps?

Summary

Email address validation and avoiding spam traps are crucial for maintaining strong sender reputation and achieving high inbox placement rates. Poor validation practices can lead to sending emails to invalid addresses, which include spam traps (also known as blocklist traps or honeypots). These are email addresses specifically set up by internet service providers (ISPs) and blocklist operators to identify and catch senders with poor list hygiene or those engaging in malicious sending practices. Hitting spam traps can severely damage your sender reputation, leading to emails being flagged as spam, reduced deliverability, and even blocklisting.

What email marketers say

Email marketers often seek efficient and cost-effective ways to validate email addresses, particularly to reduce sending to spam traps and improve deliverability. Many express a desire for tools that can identify email spam traps and honeypots. While some use API validation services, concerns about cost and effectiveness for spam trap removal are common. The consensus among marketers often leans towards proactive list management and robust opt-in processes as key to avoiding these problematic addresses, especially when direct control over lead collection is limited.

Marketer view

An email marketer from Email Geeks inquired about services to eliminate spam traps and honeypots from their lists, highlighting their current service's high costs and the need for a cheaper alternative. They emphasized the goal of mitigating these problematic addresses to improve their email program.

26 Jun 2020 - Email Geeks

Marketer view

An email marketer from Email Geeks questioned the effectiveness of basic email verification and whether services operate at the email collection level. They were particularly interested in how such tools could be integrated to prevent problematic email addresses from entering their system in the first place.

26 Jun 2020 - Email Geeks

What the experts say

Email deliverability experts largely agree that while email validation services offer some utility (like syntax checks and preventing known bad addresses), they are not a silver bullet for eliminating spam traps. The core message from experts is that true spam trap avoidance stems from robust, permission-based email acquisition practices and aggressive, ongoing list hygiene. They emphasize that attempts to mitigate issues from poor collection practices post-acquisition are often complex, painful, and generally less successful than fixing the problem at its source.

Expert view

A deliverability expert from Email Geeks asserted that email validation services cannot genuinely remove spam traps from an existing list. They clarify that the primary function of these services is not to identify and eliminate spam traps.

26 Jun 2020 - Email Geeks

Expert view

A deliverability expert from Email Geeks cautioned that some services might falsely claim to remove spam traps, accepting payment without delivering on the promise. They advise senders to be wary of such claims and focus on fundamental deliverability practices instead.

26 Jun 2020 - Email Geeks

What the documentation says

Technical documentation and industry guides consistently highlight the importance of proactive list hygiene and permission-based acquisition to avoid spam traps. They emphasize that while email validation tools can check syntax and domain validity, the primary defense against spam traps involves careful list management practices, such as regularly removing inactive subscribers and strictly enforcing opt-in. These resources often provide practical advice for safeguarding email deliverability by focusing on the quality and engagement of the subscriber list.

Technical article

SendGrid documentation states that to prevent hitting spam traps, they recommend thoroughly cleaning out your email lists at regular intervals. This proactive list management is presented as a fundamental step for maintaining good sender reputation.

01 Jan 2024 - SendGrid

Technical article

Twilio documentation advises maintaining a healthy email list by avoiding purchased lists and ensuring good list hygiene. They suggest regularly scrubbing your list for typos and removing unengaged users to improve deliverability.

10 Nov 2023 - Twilio

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