Exim Problem With One Domain

[kariha]

Domains x and y are on the same server. I am using phpmailer. Mail is sent with domain x. I am getting an error with domain y.

error output:
2020-08-27 13:48:07 CLIENT -> SERVER: EHLO www.y.com
2020-08-27 13:48:07 CLIENT -> SERVER: STARTTLS
SMTP Error: Could not connect to SMTP host.
2020-08-27 13:48:07 CLIENT -> SERVER: QUIT
2020-08-27 13:48:07 SMTP ERROR: QUIT command failed: ecurity failure554 Security failure
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

how can i fix?

 

[kariha]

is there anyone ?

 

[RoseHosting]

You can check your exim log for more information about this

 

[Richard G]

Seems more like an error caused by some script, not by Exim.

 

[mxroute]

Your software is issuing a STARTTLS request. I'm willing to bet you have it configured to use port 465 for SMTP. Change that to 587. This error is returned by Exim when a STARTTLS command is issued inside of an existing TLS connection.