Sending the message: Ajax Error

Hey there.

I am getting this error.

Sending the message: Ajax Error

Status

An unexpected error occurred:

<p>There has been a critical error on this website.</p><p>Learn more about troubleshooting WordPress.</p>

Here is the diagnostic.

Mailer: postsmtp
HostName: marijuanasa.co.za
cURL Version: 7.52.1
OpenSSL Version: OpenSSL/1.0.2u
OS: Linux 547924.cloudwaysapps.com 4.9.0-14-amd64 #1 SMP Debian 4.9.246-2 (2020-12-17) x86_64
PHP: Linux 7.3.30-1+0~20210826.87+debian9~1.gbpe56a7b en_US.UTF-8
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 5.8.1 en_US UTF-8
WordPress Theme: Porto
WordPress Plugins: Automated DHL Express live/manual shipping rates, labels and pickup, AffiliateWP, FiboSearch - AJAX Search for WooCommerce (Pro), Back In Stock Notifier for WooCommerce | WooCommerce Waitlist Pro, Breeze, Chaty, Coinbase Commerce, Conditional Payment Methods For WooCommerce, Easy Theme and Plugin Upgrades, Elementor Pro, Elementor, Force Strong Passwords, Google Analytics for WordPress by MonsterInsights, Kadence WooCommerce Email Designer, Mailchimp for WooCommerce, MalCare Security - Free Malware Scanner, Protection & Security for WordPress, Max Mega Menu, Members, PayJustNow for WooCommerce, Porto Theme - Functionality, Post SMTP, Redirection, Simple Google reCAPTCHA, Two Factor, uAfrica Shipping, UpdraftPlus - Backup/Restore, WooCommerce Peach Payments Gateway, WooCommerce Blocks, WooCommerce Bulk Discount, WooCommerce Composite Products, WooCommerce Ozow Gateway, WooCommerce SnapScan Gateway, WooCommerce Google Analytics Integration, WooCommerce Twilio SMS Notifications, WooCommerce Wholesale Prices, WooCommerce Xero Integration, WooCommerce Zapier, WooCommerce, Yoast SEO, WP All Export Pro, WP All Import Pro, WP Rollback, WP Activity Log (Premium), WP All Export - User Export Add-On Pro, WP All Export - WooCommerce Export Add-On Pro, WP All Import - WooCommerce Add-On Pro, WPForms Lite, Yoco Payment Gateway, Embed Plus for YouTube - Gallery, Channel, Playlist, Live Stream, Zapper Payments for WooCommerce
WordPress wp_mail Owner: /mnt/data/home/547924.cloudwaysapps.com/svghczjygq/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
WordPress phpmailer_init Action(s): WC_Email_New_Order->handle_multipart, WC_Email_Cancelled_Order->handle_multipart, WC_Email_Failed_Order->handle_multipart, WC_Email_Customer_On_Hold_Order->handle_multipart, WC_Email_Customer_Processing_Order->handle_multipart, WC_Email_Customer_Completed_Order->handle_multipart, WC_Email_Customer_Refunded_Order->handle_multipart, WC_Email_Customer_Invoice->handle_multipart, WC_Email_Customer_Note->handle_multipart, WC_Email_Customer_Reset_Password->handle_multipart, WC_Email_Customer_New_Account->handle_multipart
Postman: 2.0.23
Postman Sender Domain (Envelope|Message): marijuanasa.co.za | marijuanasa.co.za
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Mailgun API (https://api.mailgun.net:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 43129 | 154
Postman Email Log (Enabled|Limit|Transcript Size): Yes | 750 | 128

Issue started yesterday. And is show a error on the front end for every action that requires a email send. After checkout is complete and payment is taken it should send a email and redirect, except it gives a critical error warning, same with asking for a two factor email code to be sent.