A good idea

[865817711]

Is your feature request related to a problem?

Option Yes

Describe the solution you'd like

Version 4.8: Now, for a newly added domain, after setting the hostname as mail.newdomain, sending a test email shows that the hostname is still the domain set the first time. What should I do about this?

Describe alternatives you've considered

Version 4.8: Now, for a newly added domain, after setting the hostname as mail.newdomain, sending a test email shows that the hostname is still the domain set the first time. What should I do about this?

Additional

No response