I thought I solved the problem but it came up again.
Mailer: postsmtp
HostName: bazaaristanbul.ro
cURL Version: 7.71.0
OpenSSL Version: OpenSSL/1.1.1d
OS: Linux server-0311.whmpanels.com 4.18.0-147.8.1.el7h.lve.1.x86_64 #1 SMP Mon Jun 29 09:05:02 EDT 2020 x86_64
PHP: Linux 7.2.34 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 5.7.1 ro_RO UTF-8
WordPress Theme: Tokoo
WordPress Plugins: Query Monitor, Redux, Add to Cart Button Custom Text, WooCommerce added to cart popup (Ajax), Advanced Database Cleaner, AffiliateWP, Akismet Anti-Spam, Back In Stock Notifier for WooCommerce | WooCommerce Waitlist Pro, Conditional Payments for WooCommerce, Contact Form 7, CurieRO, Disable Admin Notices Individually, Dokan, Dokan Menu Hider, Dokan Plus, Dokan Pro, Elementor Pro, Elementor, ElementsKit Lite, ElementsKit Pro, Essential Addons for Elementor - Pro, Essential Addons for Elementor, Facebook for WooCommerce, Font Awesome, Site Kit by Google, LiteSpeed Cache, Loco Translate, MAS Brands for WooCommerce, Post Duplicator, Post SMTP, Product GTIN (EAN, UPC, ISBN) for WooCommerce, Profile Extra Fields by BestWebSoft, Really Simple SSL, Regenerate Thumbnails, Resize Image After Upload, Slider Revolution, Simple CSS, Code Embed, Tokoo Extensions, TranslatePress - Multilingual, WooCommerce Euplatesc Gateway, WooCommerce Weight Based Shipping, WooCommerce Cart Abandonment Recovery, Checkout Field Editor for WooCommerce, Product Feed PRO for WooCommerce, Woo Title Limit, WooCommerce Conversion Tracking, WooCommerce Stock Manager, WooCommerce, Yoast SEO Premium, Hide Dashboard Notifications, WP Mail Logging, Smart Image Resize PRO, Smush Pro, WP User Frontend Pro - business, WP User Frontend, WPForms, wphave - Admin, Product Import Export for WooCommerce, YITH WooCommerce Ajax Product Filter, YITH WooCommerce Badge Management Premium, YITH WooCommerce Wishlist
WordPress wp_mail Owner: /home2/r64007baza/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): TRP_Translation_Render->wp_mail_filter, wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args, No3x\WPML\WPML_Plugin->log_email
WordPress wp_mail_from Filter(s): WPUF_Email_Templates->custom_wp_mail_from
WordPress wp_mail_from_name Filter(s): WPUF_Email_Templates->custom_wp_mail_from_name
WordPress wp_mail_content_type Filter(s): WPUF_Email_Templates->mail_content_type
WordPress phpmailer_init Action(s): wpcf7_phpmailer_init, dokan_exclude_child_customer_receipt
Postman: 2.0.23
Postman Sender Domain (Envelope|Message): bazaaristanbul.ro | bazaaristanbul.ro
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Mailgun API (https://api.eu.mailgun.net:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 1303 | 75