The email is returned. The error message "Helo command rejected: Invalid name" is incorrect. helorejected

The email is returned. The error message "Helo command rejected: Invalid name" is incorrect. helorejected
I configured my own postfix + dovecot server. After outlook is configured, the same account can be successfully sent and received on some computers, and a Bounce Message will appear when an email is sent on some computers, prompting Helo command rejected: invalid name error. After analysis, it turned out to be a problem with the computer name. The computer name contains a ".", and the computer name is changed again. After the computer is restarted, it will be OK.

Why is my emails sent by Foxmail always returned?

Because foxmail needs to connect to the smtp mail server when sending mail, this prompt is displayed because the smtp server rejects the foxmail command and the host name is incorrect. Check the foxmail settings, whether the email server is correct, and whether the email address is correct. Select the email address, and right-click Properties. You can.

How to solve Helo command rejected: need fully-qualified hostname?

Rejected by Helo command: the hostname must be fully qualified, indicating that you have not used a qualified domain name. You need to fix your system so that emails can be sent smoothly.