Stopped working

Nothing could affect anything changed before it but I reversed the small changes but no result. (i had a Cronjob about posting to social media, I canceled it, yet it is still the same. tried many solutions, tried other plugins, it stopped for any email other than APIs. Sendinblue api is working, but they don’t sign the email domain, it has deliverability issues for my package. I want to be able to use Namecheap email again (privateemail.com).

log in Cpanel:
Could not open socket

I was using Namecheap email servers. They work fine on everything. I called them, nothing blocked on their side. My hosting also says nothing wrong on the domain and website hosting side.

I am using bunny CDN, w3cache, and Cloudflare DNS.

Here is the log after disabling the plugin:

Return-Path: <[email protected]>
Delivered-To: [email protected]
Received: from xxx.cprapid.com
by xxx.cprapid.com with LMTP
id xxx
(envelope-from <[email protected]>)
for <[email protected]>; Mon, 22 Feb 2021 07:54:13 +0000
Return-path: <[email protected]>
Envelope-to: [email protected]
Delivery-date: Mon, 22 Feb 2021 07:54:13 +0000
Received: from xxx by xxx.cprapid.com with local (Exim 4.93)
(envelope-from <[email protected]>)
id xxx
for [email protected]; Mon, 22 Feb 2021 07:54:12 +0000
To: [email protected]
Subject: =?us-ascii?Q?New_message_sent_by_disabled_plugin_test_using_?= =?us-ascii?Q?xxx_contact_form_at_xxx?= =?us-ascii?Q?ings?=
X-PHP-Script: xxx.com/wp-admin/admin-ajax.php for xxxx
X-PHP-Originating-Script: 1002:PHPMailer.php
Date: Mon, 22 Feb 2021 07:54:12 +0000
From: disabled plugin test <[email protected]>
Reply-To: disabled plugin test <[email protected]>
Message-ID: <[email protected]>
X-Mailer: PHPMailer 6.2.0 (https://github.com/PHPMailer/PHPMailer)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8

<p>You have received new message from: disabled plugin test<br />

Additional message is<br />
disabled plugin test