What are the common ISP bounce messages in foreign trade email marketing?

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In the process of sending emails, ISP (Internet Service Provider) often rejects emails, which not only affects the effective delivery of marketing information, but also may have an adverse impact on the marketing effect and reputation of the company. In-depth understanding of the common ISP rejection types in foreign trade email marketing is of great significance for companies to adjust marketing strategies in time and improve the success rate of email sending.
(Attachment: Revealing the truth about foreign trade email rejection and solutions )

1. Hard bounce
1. Invalid recipient email address: This is one of the most common reasons for hard bounces. When a company sends an email, if the recipient email address is misspelled, does not exist, or has been cancelled, the ISP will bounce the email. For example, when a company collects customer email addresses, due to a typo, is written as , which will cause the email to be undeliverable, resulting in a hard bounce.
2. Mailbox server refuses to receive: In some cases, the recipient's email server may refuse to receive emails for various reasons. For example, the recipient's email server has set strict filtering rules and believes that the mexico telegram number database sender's IP address is risky, or the email content contains sensitive words, the format does not meet the requirements, etc., which will cause the server to refuse to receive the email and return a hard bounce. In addition, if the recipient's mailbox has reached the storage capacity limit and can no longer receive new emails, this situation will also occur.

2. Soft bounce
1. Temporary failure of the mail server: The mail server of the ISP may be unable to receive mails temporarily due to various technical problems, such as network congestion, server maintenance, etc. At this time, the ISP will bounce the mail and tell the sender to try again later. This bounce is usually temporary, and the mail may be successfully sent when the server returns to normal. For example, during the peak period of the network, the mail server may be overloaded and unable to process all mails in time, resulting in soft bounces.
2. The recipient's mailbox is full or rejected: Although the recipient's mailbox has not been cancelled, if the mailbox is full and cannot receive new mails, the ISP will bounce the mail. In addition, the recipient may actively reject mails from certain senders in the mailbox settings, and when the enterprise sends mails, it will also receive soft bounces. For example, the recipient may have set a rejection setting for mails from a specific area or a specific type because he has received a lot of spam before.