Error Calling Post – (400) Bad Request

Hi, I’ve tried setting up Postman SMTP with the Gmail API, and it will not, no matter what I do, send the test email.

I am always confronted with the error code: Error calling POST https://www.googleapis.com/gmail/v1/users/me/messages/send: (400) Bad Request

I have browsed the WordPress forums and Google results for hours searching for a fix to this, and have found nothing, created numerous Google API Client IDs to insert, and still no luck.

Are you able to help me out in any way? Thank you very much.

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OS: Linux box1234.bluehost.com 3.12.49-35.ELK6.x86_64 #1 SMP Fri Oct 9 18:26:47 CDT 2015 x86_64
PHP: Linux 5.4.43 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 4.3.1 en_US UTF-8
WordPress Theme: Mountain
WordPress Plugins: LayerSlider WP, Akismet, Black Studio TinyMCE Widget, Carousel Slider, Column Shortcodes, Configure SMTP, Contact Form 7, Disable Comments, Easy Bootstrap Shortcode, Easy WP SMTP, Envato WordPress Toolkit, Hello Dolly, Jetpack by WordPress.com, Huge IT lightbox, MOJO Marketplace, Shortcodes for Mountain, nProjects by LineThemes, Career Portfolio, Postman SMTP, Page Builder by SiteOrigin, SiteOrigin CSS, SiteOrigin Widgets Bundle, Use Any Font, WooCommerce, WP Google Fonts, WP-Mail-SMTP
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email
WordPress wp_mail_from Filter(s): wp_mail_smtp_mail_from, c2c_ConfigureSMTP->wp_mail_from
WordPress wp_mail_from_name Filter(s): wp_mail_smtp_mail_from_name, c2c_ConfigureSMTP->wp_mail_from_name
WordPress phpmailer_init Action(s): swpsmtp_init_smtp, phpmailer_init_smtp, c2c_ConfigureSMTP->phpmailer_init
Postman: 1.7.2
Postman Sender Domain (Envelope|Message): wallaceconcepts.com | wallaceconcepts.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Gmail API (https:plain://www.googleapis.com:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 0 | 12

https://ww.wp.xz.cn/plugins/postman-smtp/