Title: Error 334
Last modified: October 30, 2022

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# Error 334

 *  Resolved [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * (@wouterdoorn)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/)
 * HI,
 * I am using your plugin to send emails through smtp.gmail.com (we have a nonprofit
   accouns for Google Workspace so we should be able to send 2000 messages per day).
 * When I send a test email everything works correctly and we are receiving emails
   throught our contact form without issues.
 * We are also sending our newsletter (using Noptin plugin) through smtp, once a
   month with new psots. After sending about 60 emails to our subscribers we suddenly
   get the following error message for all other subscribers:
 * “Communication Error [334] – make sure the Envelope From email is the same account
   used to create the Client ID.”
 * If I then send a test email, everything still seems to work correctly.
 * I have oauth setup using the available documentation, the publishing status in
   Api credentials is set to ‘in production’, the ‘from email’ is setup correctly
   and ‘Prevent plugins and themes from changing this’ is checked.
 * Any ideas whats causing this issue?
    -  This topic was modified 3 years, 7 months ago by [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/).
    -  This topic was modified 3 years, 7 months ago by [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/).

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Support [M Haseeb](https://wordpress.org/support/users/haseeb0001/)
 * (@haseeb0001)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16153048)
 * [@wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
    Hi,
 * Hope you are doing well.
 * Goto: Post SMTP -> Settings -> Message -> Email Address (Check on Prevent plugins
   and themes from changing this) and then test and let me know.
 * Thanks
 *  Thread Starter [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * (@wouterdoorn)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16153797)
 * [@haseeb0001](https://wordpress.org/support/users/haseeb0001/)
 * Thanks for the quick reply. Those options were already checked when the error
   occurred.
 *  Plugin Support [M Haseeb](https://wordpress.org/support/users/haseeb0001/)
 * (@haseeb0001)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16156794)
 * [@wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * Please share the Email log page screen shot, I need to see Failed email status
   and details.
 *  Thread Starter [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * (@wouterdoorn)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16158468)
 * [@haseeb0001](https://wordpress.org/support/users/haseeb0001/)
 * I switched to Microsoft 365 smtp instead of Google smtp and because this is only
   available with a paid extension in Post SMTP when using oAuth I switched to Fluent
   SMTP where it is free. I will try my luck with that plugin for now.
 * I will mark this issue as resolved since no further support is needed.
 *  Plugin Support [M Haseeb](https://wordpress.org/support/users/haseeb0001/)
 * (@haseeb0001)
 * [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16159531)
 * [@wouterdoorn](https://wordpress.org/support/users/wouterdoorn/) Noted, Thanks

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Error 334’ is closed to new replies.

 * ![](https://ps.w.org/post-smtp/assets/icon-128x128.gif?rev=3209655)
 * [Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App](https://wordpress.org/plugins/post-smtp/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/post-smtp/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/post-smtp/)
 * [Active Topics](https://wordpress.org/support/plugin/post-smtp/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/post-smtp/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/post-smtp/reviews/)

 * 5 replies
 * 2 participants
 * Last reply from: [M Haseeb](https://wordpress.org/support/users/haseeb0001/)
 * Last activity: [3 years, 7 months ago](https://wordpress.org/support/topic/error-334-2/#post-16159531)
 * Status: resolved