Mautic went offline after mid changes to Email Settings in Configuration on Dashboard

Product Support
1

My software Information

My Mautic version is: Mautic 5.0.3 - app/prod (env: prod, debug: false)
My PHP version is: 8.1.28
My Database type and version is: 10.3.39-MariaDB

My problem

My problem is: After changing the bounce email in Configuration on Mautic Dashboard, the site went offline.

These errors are showing in the log:

[2024-05-25T01:14:12.355881+00:00] mautic.NOTICE: PHP Notice - Unknown: Can not authenticate to IMAP server: [AUTHENTICATIONFAILED] Authentication failed. (errflg=2) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.355916+00:00] mautic.NOTICE: PHP Notice - Unknown: Retrying PLAIN authentication after [AUTHENTICATIONFAILED] Authentication failed. (errflg=1) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.355945+00:00] mautic.NOTICE: PHP Notice - Unknown: Retrying PLAIN authentication after [AUTHENTICATIONFAILED] Authentication failed. (errflg=1) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.355973+00:00] mautic.NOTICE: PHP Notice - Unknown: Can not authenticate to IMAP server: [AUTHENTICATIONFAILED] Authentication failed. (errflg=2) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.356001+00:00] mautic.NOTICE: PHP Notice - Unknown: Retrying PLAIN authentication after [AUTHENTICATIONFAILED] Authentication failed. (errflg=1) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.356028+00:00] mautic.NOTICE: PHP Notice - Unknown: Retrying PLAIN authentication after [AUTHENTICATIONFAILED] Authentication failed. (errflg=1) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}
[2024-05-25T01:14:12.356055+00:00] mautic.NOTICE: PHP Notice - Unknown: Can not authenticate to IMAP server: [AUTHENTICATIONFAILED] Authentication failed. (errflg=2) - in file Unknown - at line 0 [] {"hostname":"vps2740909","pid":60309}

After clearing cache from via command, this is what I got:

In AppKernelProdContainer.php line 11240:

  The parameter "0!riman","use_attachments":""},"EmailBundle_bounces":{"address":"bounces@xxxxxxxx.org","host":"mail.xxxxx.org","port":"993","
  encryption":"\/ssl","user":"bounces@xxxxxxxx.org","password":"xxxxxxx" must be defined.

Steps I have tried to fix the problem:

Cleared cache via php bin/console cache:clear
Restarted Openlitespeed
Restart mariadb
Reboot entire server

2

Can anyone help? I’m still stucked.

3

I am still unable to resolve this…