Some of the most common reasons include

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1. Incorrect email address If you enter the wrong recipient email address, your message will not be delivered. Please check your email address carefully before sending to avoid this problem. 2. Server issues Occasionally, the recipient's email server may experience technical difficulties, resulting in your email being undeliverable. In this case, you just have to wait for the problem to be resolved, which is a shame.


3. Spam Filters Email providers often use spam filters vietnam mobile database to stop spam from entering users' inboxes. If your message contains certain keywords or looks suspicious, it may be marked as spam and not delivered. 4. Attachment size Large attachments can sometimes cause delivery problems, especially if the recipient's email server has limits on the size of incoming files. Consider using a file sharing service to handle larger attachments.


5. Blacklist If your email address or IP address is flagged as a source of spam, your messages may not be delivered. Check whether you are on a blacklist and take steps to remove yourself if necessary. How to improve email sending success rate? Now that we understand the common causes of email delivery problems, let's explore some tips to improve your chances of successful email delivery: 1.