Post SMTP Authentication
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Hello,
I am not a professional web developer by any means so I’d really appreciate any help (and preferably simplified!) you can give.
My organization’s website utilizes contact forms, and after years of working here I just now realized that all of the contact form emails have not been going through. We have Post SMTP downloaded on WordPress, and the plugin says it’s configured, but when I try to send a test email this message comes up:
{ “error”: { “code”: 401, “message”: “Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.”, “errors”: [ { “message”: “Login Required.”, “domain”: “global”, “reason”: “required”, “location”: “Authorization”, “locationType”: “header” } ], “status”: “UNAUTHENTICATED”, “details”: [ { “@type”: “type.googleapis.com/google.rpc.ErrorInfo”, “reason”: “CREDENTIALS_MISSING”, “domain”: “googleapis.com”, “metadata”: { “method”: “caribou.api.proto.MailboxService.SendMessage”, “service”: “gmail.googleapis.com” } } ] } }
Likewise, when I go into the email log to view the old log, all of the emails show the status as “Bad Request(invalid_grant)”. All of them, going back two years.
I have tried relaunching the wizard: I choose Google API since we use Gmail. All the other info (the from email, client ID) looks good, but I don’t know for sure since I’m not a developer, nor do I know who originally built the site or downloaded this plugin. Regardless, when I click “Connect to Gmail API” I get this screen (see screenshot).
The plugin also says it needs to migrate to new logs; I have done that more than once, and nothing changes; in the new logs, I see no new emails from any date.
I’ve also tried deactivating the plugin and reactivating, but I get the same message when I get to the authentication part.
Thoughts?
Thanks everyone.
The page I need help with: [log in to see the link]
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Hello,
Thank you. Here is the diagnostic test, with screenshots below:
Mailer: postsmtp
HostName: stmarkslutheran.com
cURL Version: 7.61.1
OpenSSL Version: OpenSSL/1.1.1k
OS: Linux biz252.inmotionhosting.com 4.18.0-553.47.1.lve.el8.x86_64 #1 SMP Tue Apr 8 13:54:31 UTC 2025 x86_64
PHP: Linux 7.4.33 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
WordPress: 5.9.3 en_US UTF-8
WordPress Theme: Enfold Child
WordPress Plugins: Post SMTP, Akismet Anti-spam: Spam Protection, Classic Editor, Optimus, SVG Support, UpdraftPlus – Backup/Restore, Yoast SEO, WP Downgrade | Specific Core Version, WP Fastest Cache
WordPress wp_mail Owner: /home/stmark17/public_html/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
Postman: 3.2.0
Postman Sender Domain (Envelope|Message): stmarkslutheran.com | stmarkslutheran.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Gmail API (https:login://www.googleapis.com:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 2144 | 5570Please note that the only reason two different emails show on the log is because I was trying to see if I could get messages to go through to a different email. Messages don’t go through to the original email or the other one.
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