vectorhold

It turned out to be a conflict with booster plus, latest update has fixed it.

There is no function wp_mail() {} in the wp-config file.

Thanks for advising.
I have disabled as advised and the issue still persists, diagnostic below with wordfence disabled.

Mailer: postsmtp
HostName: sapphirestudiosdesign.com
cURL Version: 7.74.0
OpenSSL Version: OpenSSL/1.1.1n
OS: Linux pod-120426:apache2_80:254 5.4.0-1072-gcp #77~18.04.1-Ubuntu SMP Wed Apr 13 07:49:40 UTC 2022 x86_64
PHP: Linux 8.0.22 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 6.0.2 en_US UTF-8
WordPress Theme: Beaver Builder Child Theme
WordPress Plugins: Gravity Perks, Gravity Forms, WooCommerce Starshipment Order, WooCommerce Currency Switcher - Product Add-ons Integration, Aelia Shipping Pricing for Currency Switcher, Alerts for Beaver Builder, Beaver Builder Plugin (Pro Version), Beaver Themer, Ultimate Addons for Beaver Builder, PowerPack for Beaver Builder, Booster Plus for WooCommerce, Campaign Monitor for WooCommerce, Code Snippets, Duplicate Page, Easyship, Enable Media Replace, FacetWP - Beaver Builder, FacetWP - Range List, FacetWP, GP File Upload Pro, Gravity Forms Zero Spam, OMGF, iQ Block Country, Kadence WooCommerce Email Designer, Max Mega Menu - Pro Addon, Max Mega Menu, PixelYourSite Pinterest, PixelYourSite PRO, Post SMTP, Really Simple SSL, Regenerate Thumbnails, WooCommerce Send Emails, Sezzle WooCommerce Payment, ShortPixel Adaptive Images, Simple History, Temporary Login Without Password, TI WooCommerce Wishlist, TP Product Image Flipper for Woocommerce, Tracking Code Manager, Use Any Font, Aelia Foundation Classes for WooCommerce, Aelia - Use WP Engine geolocation, Password Strength Settings for WooCommerce, Pin Payments - WooCommerce Payment Gateway, WPC Custom Related Products for WooCommerce, Woo Partial.ly, Premmerce Permalink Manager for WooCommerce, Preview E-mails for WooCommerce, Product Feed ELITE for WooCommerce, WooCommerce Random Product Sorting with Pagination, Integration for WooCommerce and Zoho, WooCommerce Print Address Labels, WooCommerce Admin Custom Order Fields, Aelia Currency Switcher for WooCommerce, WooCommerce Checkout Add-Ons, Print Invoice & Delivery Notes for WooCommerce, Follow-Up Emails, WooCommerce Stripe Gateway, Pixel Manager for WooCommerce, WooCommerce Google Analytics Pro, WooCommerce Name Your Price, WooCommerce Order Status Manager, WooCommerce Product Add-ons, WooCommerce Product Categories Selection, WooCommerce Product Search, WooCommerce Remove Product Sorting, WooCommerce Sequential Order Numbers Pro, WooCommerce Shipment Tracking, WooCommerce Shop as Customer, WooCommerce Smart Coupons, WooCommerce Table Rate Shipping, Aelia Tax Display by Country for WooCommerce, WooCommerce, WooPack for Beaver Builder, WordPress Importer, Yoast SEO Premium, Yoast SEO, WPC Smart Search, Asset CleanUp Pro: Page Speed Booster, WP Engine GeoTarget, Yoast SEO: WooCommerce, Zip - WooCommerce
WordPress wp_mail Owner: /nas/content/live/sapphirestudio/wp-includes/pluggable.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
WordPress phpmailer_init Action(s): FUE_Sending_Mailer::set_dkim, 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_SC_Email_Coupon->handle_multipart, WC_SC_Combined_Email_Coupon->handle_multipart, WC_SC_Acknowledgement_Email->handle_multipart, WC_Stripe_Email_Failed_Renewal_Authentication->handle_multipart, WC_Stripe_Email_Failed_Preorder_Authentication->handle_multipart, WC_Stripe_Email_Failed_Authentication_Retry->handle_multipart, PostsmtpMailer->phpmailer_smtp_init
Postman: 2.1.8
Postman Sender Domain (Envelope|Message): sapphirestudiosdesign.com | sapphirestudiosdesign.com
Postman Prevent Message Sender Override (Email|Name): Yes | Yes
Postman Active Transport: SMTP (smtp:tls:login://smtp.office365.com:587)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 64040 | 1079
Postman Stealth Mode: Yes

Actually, emails are only sending if we use PHPmailer, but then our plugin “WooCommerce Send Emails” does not work with PHPmailer, so we need to be able to use PostSMTP. Thanks for your help.

Mailer: postsmtp
HostName: sapphirestudiosdesign.com
cURL Version: 7.74.0
OpenSSL Version: OpenSSL/1.1.1n
OS: Linux pod-120426:apache2_80:254 5.4.0-1072-gcp #77~18.04.1-Ubuntu SMP Wed Apr 13 07:49:40 UTC 2022 x86_64
PHP: Linux 8.0.22 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 6.0.2 en_US UTF-8
WordPress Theme: Beaver Builder Child Theme
WordPress Plugins: Gravity Perks, Gravity Forms, WooCommerce Starshipment Order, WooCommerce Currency Switcher - Product Add-ons Integration, Aelia Shipping Pricing for Currency Switcher, Alerts for Beaver Builder, Beaver Builder Plugin (Pro Version), Beaver Themer, Ultimate Addons for Beaver Builder, PowerPack for Beaver Builder, Booster Plus for WooCommerce, Campaign Monitor for WooCommerce, Code Snippets, Duplicate Page, Easyship, Enable Media Replace, FacetWP - Beaver Builder, FacetWP - Range List, FacetWP, GP File Upload Pro, Gravity Forms Zero Spam, OMGF, iQ Block Country, Kadence WooCommerce Email Designer, Max Mega Menu - Pro Addon, Max Mega Menu, PixelYourSite Pinterest, PixelYourSite PRO, Post SMTP, Really Simple SSL, Regenerate Thumbnails, WooCommerce Send Emails, Sezzle WooCommerce Payment, ShortPixel Adaptive Images, Simple History, Temporary Login Without Password, TI WooCommerce Wishlist, TP Product Image Flipper for Woocommerce, Tracking Code Manager, Use Any Font, Aelia Foundation Classes for WooCommerce, Aelia - Use WP Engine geolocation, Password Strength Settings for WooCommerce, Pin Payments - WooCommerce Payment Gateway, WPC Custom Related Products for WooCommerce, Woo Partial.ly, Premmerce Permalink Manager for WooCommerce, Preview E-mails for WooCommerce, Product Feed ELITE for WooCommerce, WooCommerce Random Product Sorting with Pagination, Integration for WooCommerce and Zoho, WooCommerce Print Address Labels, WooCommerce Admin Custom Order Fields, Aelia Currency Switcher for WooCommerce, WooCommerce Checkout Add-Ons, Print Invoice & Delivery Notes for WooCommerce, Follow-Up Emails, WooCommerce Stripe Gateway, Pixel Manager for WooCommerce, WooCommerce Google Analytics Pro, WooCommerce Name Your Price, WooCommerce Order Status Manager, WooCommerce Product Add-ons, WooCommerce Product Categories Selection, WooCommerce Product Search, WooCommerce Remove Product Sorting, WooCommerce Sequential Order Numbers Pro, WooCommerce Shipment Tracking, WooCommerce Shop as Customer, WooCommerce Smart Coupons, WooCommerce Table Rate Shipping, Aelia Tax Display by Country for WooCommerce, WooCommerce, WooPack for Beaver Builder, Wordfence Security, WordPress Importer, Yoast SEO Premium, Yoast SEO, WPC Smart Search, Asset CleanUp Pro: Page Speed Booster, WP Engine GeoTarget, Yoast SEO: WooCommerce, Zip - WooCommerce
WordPress wp_mail Owner: /nas/content/live/sapphirestudio/wp-includes/pluggable.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
WordPress wp_mail_from Filter(s): wordfence::fixWPMailFromAddress
WordPress phpmailer_init Action(s): FUE_Sending_Mailer::set_dkim, 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_SC_Email_Coupon->handle_multipart, WC_SC_Combined_Email_Coupon->handle_multipart, WC_SC_Acknowledgement_Email->handle_multipart, WC_Stripe_Email_Failed_Renewal_Authentication->handle_multipart, WC_Stripe_Email_Failed_Preorder_Authentication->handle_multipart, WC_Stripe_Email_Failed_Authentication_Retry->handle_multipart, PostsmtpMailer->phpmailer_smtp_init
Postman: 2.1.8
Postman Sender Domain (Envelope|Message): sapphirestudiosdesign.com | sapphirestudiosdesign.com
Postman Prevent Message Sender Override (Email|Name): Yes | Yes
Postman Active Transport: SMTP (smtp:tls:login://smtp.office365.com:587)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 64040 | 1079
Postman Stealth Mode: Yes

No filter queries that can be used with metadata so it does not display on the invoice?

Perfect! you guys are awesome, I did try through CSS but had the syntax wrong.