The overseas email format seems to be fine, but why do emails keep bouncing after I send them?

Overseas email addresses have usernames and"@", the domain name after it is also complete, and there seems to be no problem. When I actually started sending, I kept receiving bounced emails: some addresses did not exist, some were temporarily undeliverable, and some emails were not returned but went directly to spam.

If the mailbox format is correct, it only means that the string of characters conforms to the basic writing method. It does not prove that the mailbox actually exists, nor does it guarantee that the other party can still receive the mail normally. Overseas mail frequently bounces back, so you need to check the receiving email address, sending domain name, and outgoing mail at the same time.IP and sending frequency. Digital Planet's real-time effective global mailbox detection can first process the receiving address layer, separate mailboxes that are obviously invalid and need further verification, and then continue to check for problems on the sending end.

A mailbox that appears to be complete may also have expired.

picture[email protected]Such an address does not lack any part in terms of format, but there may be different circumstances behind it: the email address has never been registered, the original user has logged out, the address has been deactivated after a company employee resigned, or the domain name still exists, but normal email receiving services are not configured.

Some mailboxes do exist, but the inbox is full, or the server is under maintenance. This type of address is not necessarily permanently invalid, but it is currently unable to receive messages normally.

Ordinary format checks usually only find missingObvious problems such as "@", incomplete domain name, incorrect characters, etc. To determine whether the email is worth continuing to send, it is also necessary to further confirm whether the email domain name can receive emails, whether there are obvious abnormalities in the address, and whether there have been any bounces before.

When there is a large amount of mailbox data, it can be sent to Digital Planet for batch testing first. Digital Planet supports real-time and effective detection of global mailboxes, which is suitable for completing the first round of mailbox cleaning before official sending, reducing the number of obviously invalid addresses that directly enter the mass sending system.

Bounce letters cannot just be recorded as"Failed to send"

After receiving a bounce notification, the most important thing is to check the status code and specific instructions returned by the mail server.

byThe status starting with "4" usually indicates a temporary delivery failure, which is often referred to as a soft bounce. The mailbox may be real, but the inbox capacity is insufficient, the server is temporarily busy, the sending frequency is too high, or the mail is delayed.

Soft bounces are not suitable for immediate deletion. You can try again later based on the reason for the bounce. If temporary failures occur multiple times in a row for the same mailbox, consider suspending sending.

byThe status starting with "5" is usually a permanent failure, also called a hard bounce. Common reasons are that the mailbox does not exist, the address has been deactivated, the domain name cannot be received, or the receiving server explicitly rejects the email.

Mailboxes that have been confirmed to have hard bounces are not suitable for repeated sending. The more times you send, not only will the delivery not be restored, but it may also affect the reputation of the sending domain name.

When sorting out the results, at least separate the invalid mailbox itself, the temporary undeliverability and the rejection of the sender. Digital Planet can first help determine whether the mailbox has the basis for continued use, but the specific reason for the bounce must be combined with the analysis of the information returned by the mail server.

The email address is valid, but the email may still be rejected.

Some email bounces are not because the customer's email address is invalid, but because the sending domain name has not completed the identity verification.

according toGoogle's current email sending specifications, senders who send emails to personal Gmail addresses need to configure SPF or DKIM. Bulk senders who send close to or more than 5,000 emails to personal Gmail addresses in a single day also need to configure SPF, DKIM, and DMARC at the same time, and provide one-click unsubscribe functionality for marketing emails.

SPF is used to indicate which servers can send letters on behalf of the current domain name; DKIM is used to verify whether the email is sent from the corresponding domain name and whether the content is modified during transmission; DMARC is used to process emails that fail verification.

If these configurations are missing, incorrect, or conflict with each other, even if the receiving mailbox is completely normal, the mail may still be rejected, delayed, or placed in spam.

When you have just changed your email service provider, added a new mass sending platform, or used multiple systems to send emails at the same time, it is more likely that the authentication configuration will not be synchronized. In this case, continuing to clean the customer's mailbox will not completely solve the problem of bounced emails, and technicians will need to check the sending domain name.

SendIP reputation also affects delivery

Send the sameIP may be used by multiple domain names. If other senders in the shared IP send spam in large numbers, normal mail may also be affected.

newIPs or IPs that have no sending records for a long time also lack stable reputation. There were very few emails sent on the first day, but suddenly a large number of emails were sent the next day, which could easily trigger the limit of the receiving server.

When sending overseas mail in bulk, the sending volume should be gradually increased. Start with customers with recent inquiries, historical interactions, and explicit subscriptions, and then slowly expand the scope based on bounces and complaints.

If similar bounces occur in a large number of mailboxes with different domain names at the same time, don't rush to think that the entire batch of customer data is invalid. Check the shipment firstWhether the IP has entered the block list, whether the sending speed has increased too fast, and whether the server is correctly configured with forward and reverse DNS records.

Bounces and spam are not the same problem

Bounces indicate that the mail was not delivered properly. Entering spam means that the email has been received but has been judged by the system as not suitable for entering the primary inbox.

If a mailbox passes the Digital Planet test and is shown to be capable of normal use, emails sent may still go into the trash. Common reasons include:

lThe recipient has not actively subscribed;

lThe email content has nothing to do with the user’s original needs;

lThe same domain name is sent too large in a short period of time;

lThe email contains a lot of marketing words or suspicious links;

lThe sending address lacks normal interaction for a long time;

lUsers frequently mark emails as spam;

lSending domain name orIP reputation is low;

lThere is no clear way to unsubscribe.

Therefore, the email validity detection solves the problem of"Can the address continue to be used?" cannot replace email content, user authorization and domain name reputation management.

The 0.3% complaint rate is not as loose as imagined

according toGoogle currently requires that the spam complaint rate of the sending domain should be kept below 0.1% and avoid reaching 0.3% or higher.

sendFor 10,000 emails, as long as 30 recipients mark the email as spam, the complaint rate will reach 0.3%. For overseas mailbox data whose source is unclear and stored for a long time, this amount can easily occur.

This also shows that just because the mailbox can receive mail normally, it does not mean that it is suitable for continued marketing. If the other party has unsubscribed, explicitly refused, or has never agreed to receive emails, even if the address is real and valid, you should not continue to send emails.

After using Digital Planet to complete the mailbox validity check, it is necessary to continue classifying based on customer sources, subscription records and historical interactions. Emails that have been explicitly unsubscribed or rejected cannot be put back into the sending range just because the detection is normal.

Reduce unnecessary bounces before sending

Before officially sending, you can put the email addresses obtained through different channels together to remove duplicates. The same user may repeatedly leave email addresses in advertising forms, website inquiries, and historical orders. If not processed, multiple similar emails may be received in a short period of time.

After completing the deduplication, check the email format and domain name. Addresses that are obviously missing some content, have spelling errors, or have non-existent domain names can be checked individually first.

The next step is to use Digital Planet's global mailbox real-time and effective detection to conduct batch verification of existing mailboxes. After detection, separate the data that can continue to be used, have abnormalities and need to be reviewed. Do not directly import all addresses into the email marketing system.

After checking the email address, check whether the sending domain name is complete.SPF, DKIM and DMARC configuration. There were no obvious problems with the mailbox data and the sending system, so we entered the small-scale sending test.

Don’t pursue sending quantity in the first round. First observe the hard bounces, soft bounces, spam complaints and unsubscriptions, and then decide whether to increase subsequent sending volume.

Use actual records to determine where the problem lies

Assume ready to send10,000 overseas mails. This number is only used to illustrate the accounting method.

Before sending, record the number of original mailboxes, the number of duplicate mailboxes, the number of format errors, and the number of mailboxes that need to be paused or reviewed after Digital Planet detection. After cleaning is completed, the data actually entering the email system will be less than the original10,000 pieces.

After sending, continue to record successful delivery, temporary bounces, permanent bounces, unsubscriptions and complaints.

If hard bounces are concentrated in a certain customer data collected earlier, it usually means that the mailbox has expired; if authentication errors occur in mailboxes from different sources and different domain names at the same time, you should check the sender settings; if the mail is delivered normally but is constantly marked as spam, the problem may lie in the sending object, content and contact frequency.

Don’t just look at open rates.Google has made it clear that it cannot verify that open rates provided by third parties are accurate, and low open rates do not necessarily indicate delivery failure. SMTP bounce, domain name authentication, complaint rate and IP reputation are more suitable for troubleshooting email delivery problems.

These types of mailboxes are not suitable for continued sending

Hard bounce mailboxes that clearly indicate that the address does not exist, the account has been deactivated, or the domain name cannot receive mail should be removed from the current sending range.

Emails that have been unsubscribed, explicitly rejected, or generated complaints cannot continue to send marketing content even if they pass the validity test. The mailbox status is normal and the user is willing to receive emails are two different things.

Mailboxes with temporary bounces can be kept for review, but the number of retries must be limited. After multiple consecutive failed deliveries, you should pause sending and recheck the status.

For mailboxes that have been delivered normally but have not had any interaction for a long time, you can reduce the frequency of sending, or re-confirm whether the other party is willing to continue receiving.

Digital Planet is suitable for completing mailbox validity checks before sending overseas mails to reduce the amount of sending quota occupied by invalid addresses. Subsequent processing still needs to be combined with bounce codes, shipping certification, complaints and unsubscription records. Only by checking both the receiving mailbox and the sending system clearly can we find the real reason why emails frequently bounce.

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