Bad Request(invalid_grant)

Hi,

The log shows that emails are not being delivered and repot the error: Bad Request(invalid_grant)

Here is my Diagnostic log:

Mailer: postsmtp
HostName: hauswitchstore.com
cURL Version: 7.70.0
OpenSSL Version: OpenSSL/1.1.1g
OS: Linux box6080.bluehost.com 4.14.94-164.ELK.el6.x86_64 #1 SMP Wed Jan 16 16:56:35 CST 2019 x86_64
PHP: Linux 7.0.33 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 5.4.2 en_US UTF-8
WordPress Theme: Bridge
WordPress Plugins: LayerSlider WP, PW Advanced Woo Reporting, Akismet Anti-Spam, Titan Anti-spam & Security, Bridge Core, Coming Soon Page, Under Construction & Maintenance Mode by SeedProd, Contact Form 7 Extension For Mailchimp, Contact Form 7, Custom Scrollbar, Disable Gutenberg, Easy Social Icons, Enable Media Replace, Facebook for WooCommerce, Formidable Forms, Frontend Publishing, Site Headers Plugin for HausWitch.com, Smash Balloon Instagram Feed, Jetpack by WordPress.com, WPBakery Page Builder, Justuno Social Offers, Mailchimp for WooCommerce, MC4WP: Mailchimp for WordPress, Post SMTP, WooCommerce PDF Invoices, Packing Slips, Delivery Notes & Shipping Labels (Basic), PW WooCommerce Gift Cards Pro, Qode Instagram Widget, Really Simple SSL, Regenerate Thumbnails, Rename wp-login.php, Slider Revolution, SEO Redirection, Shopkeeper Typekit Fonts, Envato Toolkit, Under Construction, Visitor Traffic Real Time Statistics, WooCommerce Email Customizer, WooCommerce PayPal Checkout Gateway, WooCommerce Google Analytics Integration, Woocommerce Products Per Page, WooCommerce Services, WooCommerce Stamps.com API integration, WooCommerce USPS Shipping, WooCommerce Square, WooCommerce, WooCommerce Events, WordPress Importer, Yoast SEO, WP File Manager, WP Instagram Widget, WP-Live Chat by 3CX, WP Migrate DB Pro, Smush, Easy Forms for Mailchimp
WordPress wp_mail Owner: /home1/hauswitc/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 wp_mail_content_type Filter(s): Mail_Helper->set_content_type, Mail_Helper->set_content_type
WordPress phpmailer_init Action(s): wpcf7_phpmailer_init, 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, WC_Email_PW_Gift_Card->handle_multipart, WooCommerce\Square\Emails\Sync_Completed->handle_multipart, WooCommerce\Square\Emails\Access_Token_Email->handle_multipart
Postman: 2.0.12
Postman Sender Domain (Envelope|Message): hauswitch.com | hauswitch.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Gmail API (https:oauth2://www.googleapis.com:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 27354 | 859

Any idea what the issue is and how to fix it?

Thank you!