Hello @johnboy85 ,
Thank you for reaching out to our Support team. We’re truly sorry to hear that you’ve encountered this issue.
Kindly share your Diagnostic test report with us. It will allow us to understand your setup & assist you effectively.
I have censored some of the URL names since this forum is public.
Mailer: postsmtp
HostName: ************.com
cURL Version: 8.14.1
OpenSSL Version: OpenSSL/1.1.1w
OS: Linux rs4-or.serverhostgroup.com 4.18.0-553.40.1.lve.el8.x86_64 #1 SMP Wed Feb 12 18:54:57 UTC 2025 x86_64
PHP: Linux 8.2.29 C.UTF-8
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 6.9 en_US UTF-8
WordPress Theme: AirSupply-child
WordPress Plugins: Post SMTP, Contact Form 7, Contact Form Entries, Essential Grid, EWWW Image Optimizer, Favicon by RealFaviconGenerator, Font Awesome, Heartbeat Control by WP Rocket, WP Armour - Honeypot Anti Spam, WPBakery Page Builder, LiteSpeed Cache, MC4WP: Mailchimp for WordPress, QuickCal, Slider Revolution, Rank Math SEO PRO, Rank Math SEO, Simple History, Temporary Login Without Password, ThemeREX Updater, ThemeREX Utilities, Under Construction, YellowPencil Pro, Wordfence Security, WP Armour Extended - Honeypot Anti Spam
WordPress wp_mail Owner: /home/*********/*************.com/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_from Filter(s): wordfence::fixWPMailFromAddress
WordPress phpmailer_init Action(s): wpcf7_phpmailer_init, PostsmtpMailer->phpmailer_smtp_init
Postman: 3.8.0
Postman Sender Domain (Envelope|Message): ************.com | ***********.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Other SMTP (smtp:tls:oauth2://smtp.gmail.com:587)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 884 | 1274
Thank you so much for sharing the requested information.
I can see that you are currently using Gmail via SMTP. To mitigate the issue you’re experiencing, I would recommend switching to the Gmail API, which is more stable and reliable.
To proceed, please click the Relaunch Wizard button on the Post SMTP Dashboard and select the Gmail API (Gmail socket) option. You can follow our comprehensive documentation, which walks through the setup process step by step.
Should you need any assistance during the setup, please feel free to reach out. I’ll be happy to help.
That worked. Once I clicked relaunch wizard and chose the Gmail API a new window popped up and asked for me to give Google permissions for the plugin to send emails. My Client ID and Client secret auto refilled and then I sent a test email which worked.
It seems I just needed to give Google permissions again to fix the plugin. Easy fix.
Thanks for your help!
Hey @johnboy85
I am glad that the issue has been resolved.
If Post SMTP has been useful, I’d request you to leave your kind reviews.
HEllo, I had the same error and I partially solved like suggested in this thread. The problem is that I created the clientID and secret with my personal gmail account, but now is asking me to grant for the company gmail account. How the plugin generate that grant link? why is not redirecting me with the app account owner?
