Why is the email sending failed?

Why is the email sent unsuccessfully? A netizen consulted Xiaobian online, Xiaobian gave the following reply, mainly based on the phenomenon that the e-mail failed to be sent under different circumstances.

In fact, when we send an e-mail, we receive an e-mail with the following contents:

Reason for failure: connected to the other party's mail server, but rejected by the other server after the transfer is completed receive.

Solution: Your email may contain content that the other party refused to receive. Please modify it and try again.

Or yes: The message could not be sent to the address you specified. The message could not be delivered during the message transfer due to an external unavoidable error.

Reason for failure: Connect to the other party's mail server, but the other server does not receive this recipient.

Solution: Maybe this recipient does not exist, or your spelling has an error, please verify and resend.

So what do we do? The reason for the email delivery failure is:

1. The other party's server timed out. Indicates that the other party's mail server has not been turned on for some reason or the system has experienced a serious fault. In this case, you can usually send it again in a few days or send it to another address of the other party.

2. The failure of the sending server (SMTP). SMTP failures can occur either on an SMTP server using a registered ISP or on a free SMTP server. Some SMTP servers are very unstable, often crash, and even suddenly cancel the SMTP function. If the original settings are still used, mail may not be sent.

3. The email address is incorrect. Since the e-mail address is composed of various characters, it is easy to misunderstand the characters such as English and numbers or input errors on the computer without paying attention. For example, the underline "_&" is used as the connector "--" “. ”Knock into “. ”, the English "ld"; o & rdquo; as the Arabic numerals in the ""

4, the email is too large. In order to use network resources more effectively, ISPs often limit the size of emails and need to encode them before sending emails, increasing the size of emails by 5% to 20%. Therefore, when sending a large attachment, it is best to divide it into several smaller parts and send it through several emails, which can reduce the probability of sending errors.