Title: Randon error with code 423
Last modified: March 29, 2023

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# Randon error with code 423

 *  Resolved [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * (@wouterdoorn)
 * [3 years, 2 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/)
 * Hi,
 * I am using Fluent SMTP in a multisite setup with subfolders with Microsoft 365
   smtp. The token is setup correctly as far as I can tell and most emails are send
   correctly, but about 1 in every 10 emails that are send through our contact form
   and about 1 in every 100 that are send as a newsletter are not send and get a
   code 423. This seems to happen in a random pattern. If I then manually resend
   them they are send without issues. Any ideas whats causing the issue?
    -  This topic was modified 3 years, 2 months ago by [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/).

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Support [Amimul Ihsan](https://wordpress.org/support/users/amimulihsanmahdi/)
 * (@amimulihsanmahdi)
 * [3 years, 2 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/#post-16609556)
 * Hello [@wouterdoorn](https://wordpress.org/support/users/wouterdoorn/),
 * The error message comes from outlook API calls. There might be an issue with 
   the email limit or permission hence the emails are getting failed on multisite.
   You may contact Outlook regarding the error message.
 * Thank you
 *  [Frank](https://wordpress.org/support/users/frankoutsole/)
 * (@frankoutsole)
 * [2 years, 9 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/#post-17004204)
 * Has this issue ever been resolved? I’m having about the same issue. Only with
   FluentSMTP and any other plugin works fine.
 *  Thread Starter [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/)
 * (@wouterdoorn)
 * [2 years, 9 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/#post-17004216)
 * No. In the end I switched to SMTP2GO, a paid service which has been working great.
    -  This reply was modified 2 years, 9 months ago by [wouterdoorn](https://wordpress.org/support/users/wouterdoorn/).
 *  [Frank](https://wordpress.org/support/users/frankoutsole/)
 * (@frankoutsole)
 * [2 years, 9 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/#post-17004218)
 * Thanks for your reply! I’ve been using paid services for a long time without 
   any issues. A friend told me about FluentSMTP which seems to be a great plugin
   on first sight. Unfortunately about 3-5% of the e-mails are failing with this
   error, randomly. Manual resending works fine. Happy I’m not the only one 🙂 Fijne
   avond gewenst!

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Randon error with code 423’ is closed to new replies.

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 * 4 replies
 * 3 participants
 * Last reply from: [Frank](https://wordpress.org/support/users/frankoutsole/)
 * Last activity: [2 years, 9 months ago](https://wordpress.org/support/topic/randon-error-with-code-423/#post-17004218)
 * Status: resolved