This step must be done before sending mass emails: How can global mailbox detection improve delivery rate?

In global email marketing, many companies face a common problem:Although tens of thousands of email addresses were imported, a large number of bounced emails were received after mass sending, and the email open rate was extremely low.

The problem isn’t the content, it’s the email itself——Those mailbox data that have not been tested and cleaned are often mixed with invalid, inactivated, forged, rejected and other types, directly leading to failure to reach them.

Global mailbox detection, has become the implementation Email Necessary steps before mass sending. Not only can it improve the delivery rate and click-through rate, but it can also protect the reputation of the sending domain name and reduce the risk of entering the trash can.

1. Why Email Is it necessary to conduct global mailbox testing before mass sending?

1. Reduce the risk of bounced letters and improve the reputation score of sending items

Email bounce (Bounce) will be regarded as "low-quality delivery" by email service providers. The higher the bounce rate, the easier it is for future emails to enter the trash can or even be rejected directly.

Through global mailbox detection, unreachable mailboxes can be identified in advance, which can effectivelyControl the bounce rate within a reasonable range, to ensure the health score of the sending domain name.

2. Remove invalid and fake mailboxes to avoid waste of resources

Although many email addresses are in the correct format, they are expired accounts, canceled email addresses, temporary email addresses, or even do not exist at all.

Sending these mailboxes directly will not only waste mail resources and server costs, but may also be marked as"Malicious Email Behavior".

3. Improve email delivery rate and real reach rate

filter outreal existence+ Can receive emails + Active useYour mailbox is the foundation for improving the efficiency of mass sending.

Only these emails can be seen, opened, clicked, and eventually converted by users.

2. Common mailbox problem types and detection targets

The goal of performing global mailbox detection is to eliminate the following types of mailboxes:

An effective global mailbox detection tool should have the ability to identify the above problems and output the results in a structured manner.

3. Common processes and methods for mailbox detection

1. Grammar and format cleaning

First determine whether the email address conforms to the standard format, for example:

lDoes it contain"@" and legal domain name

lWhether it contains illegal characters (such as Chinese, spaces)

lWhether the common misspelling domain is hit (gmial.com,hotmial.comwait)

This step can quickly clear out obviously invalid mailboxes.

2. SMTP real-time verification

via Mail Transfer Protocol (SMTP) simulates the sending process and determines whether the target mailbox exists:

lConnect to email server

lCheck if the mailbox accepts connections

lGet server return code (250 means it exists, 550 means it doesn’t exist)

This step excludes email addresses that don't exist or are closed.

3. Analysis of rejection rules and delivery behavior

Although some mailboxes exist, interception rules have been set, such as:

lReject emails from unfamiliar domain names

lWhitelist mechanism

lAutomatic bounce configuration

Such mailboxes can be flagged by detecting specific codes returned by the server.

4. Email risk rating and label classification

Output the detection results in a structured format and label them:

lValid email

lSuspicious email

lEmail does not exist

lHigh-risk mailboxes (such as easily bounced and extremely low activity)

Enterprises can formulate different delivery strategies according to different risk levels to avoid"One size fits all."

4. How to efficiently perform global mailbox detection?

When the amount of mailbox data reaches tens of thousands, manual detection is no longer realistic. Specialized platforms are the first choice for performing global mailbox inspections.

The following are the capabilities that an efficient detection platform should have:

lSupports batch import of mailbox lists (CSV, TXT, Excel)

lAutomatically perform format verification+ SMTP verification + letter rejection judgment

lOutput structured detection results (status, labels, recommendations)

lSupports multiple country email suffixes and is compatible with global email service providers

lPassableAPI or task system docking with CRM/marketing platform

Digital Planet PlatformAs an intelligent detection tool with global coverage, it has served a large number of cross-border marketing, private domain operations, and e-commerce customers and has the following advantages:

lsupport100+ national email formats and verification channels

lCan identify temporary email platforms and risky address segments

lsupplySMTP detection + dual judgment of mailbox activity

lOutput detailed detection reports and support group export

lCan connect to existing marketing systems and automatically synchronize available email lists

After using the Digital Planet platform for detection, companies can usuallyThe email bounce rate is controlled atBelow 3%, the email open rate and conversion rate are significantly improved.

5. Suggested procedures for cooperating with testing before and after mass distribution

In order to maximize the use of global mailbox detection, it is recommended to form the following process:

1.data collection stage: Preliminary cleaning of mailboxes with irregular formats

2.Import detection platform: Execute comprehensiveSMTP and risk judgment

3.Classification export results: Filter high risk based on tags/invalid email

4.Random inspection before mass mailing: Verify whether the system can receive correctly

5.Analysis after mass mailing: Detect and update bounced letters again

6.Periodic review mechanism: Check the existing list every quarter to ensure stable quality

Under the trend of increasingly sophisticated global email marketing,"Data is valid" is far more meaningful than "data is huge".EmailIf you want to send mass messages stably, accurately and efficiently, the first step is to start fromMailbox availability filtering begins.

If you are planning a global email launch, you may wish toDigital Planet PlatformTest your email list once and establish a basic asset that is truly usable, accessible, and convertible.

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