CentOS

Problem solved, thank you

error message: SSL/TLS Failure: Unknown error-5938.Is there anything wrong with my certificate? Error-5938 is related to establishing the SSL protocol connection. It is the SSL-certificate on the server you are connecting to that is used for the encryption of the connection and verification of the ...

Which port number did you configure? Should be in the setting for relay_host. Default port is 25. I think outlook.com wants 587 for STARTTLS to function. Yes, I have set SMTP= smtps://smtp.outlook.com : 465, or 587. The above prompt still appears。You may be talking about the configuration of Postfix

dthacker9 wrote: ↑

2020/06/12 19:57:10

What are the mail logs saying?

hi,dthacker9
When I send the email, it prompts the error message: SSL/TLS Failure: Unknown error-5938.Is there anything wrong with my certificate?

Why can't CentOS send mail when sendmail and mailx are installed? The configuration example is as follows:
/etc/mail.rc

set from=bp**@outlook.com
set smtp=smtp.office365.com
set smtp-auth-user=bp**@outlook.com
set smtp-auth-password=1234
set smtp-auth=login

TrevorH wrote: ↑

2020/03/03 08:50:03

No, the default setting is UseDNS yes. If you haven't changed it then it will be in effect. And the question is if you have a Match stanza that overrides it for a partition group or user that might include root but not you new name.

Yes, how to explain why logging in is slow after changing root?

Yes, the default is UseDNS No

I logged in via SSH because I didn't want the superuser to be exploited by network attackers, I tried to change the superuser back to root, which logged in very quickly

hi,all
Why is it so slow to log in after changing the root username and waiting 26 seconds
thanks