Title: Version 4.0.0-beta.1 issues
Last modified: August 24, 2026

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# Version 4.0.0-beta.1 issues

 *  Resolved [vurvargurgar](https://wordpress.org/support/users/vurvargurgar/)
 * (@vurvargurgar)
 * [1 week, 6 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/)
 * I get the error message **“Outgoing Mail Server Hostname and Port cannot be empty”**
   when selecting **Yes** to use a fallback, and no further options appear when 
   selecting Yes, as the guide says. Disabling **Use fallback** produces the same
   error message.

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

 *  Plugin Support [M Aqib Khan](https://wordpress.org/support/users/aqibkhan9/)
 * (@aqibkhan9)
 * [1 week, 5 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/#post-19002049)
 * Hey [@vurvargurgar](https://wordpress.org/support/users/vurvargurgar/)
 * Thanks for reporting this and for sharing the details.
 * It looks like you received 4.0.0-beta.1, which was a pre-release build that was
   inadvertently made available through the production release channel. The issue
   you’re seeing with the fallback configuration is related to that beta build.
 * We have now released [Post SMTP 4.0.1](https://drive.google.com/file/d/1nXpElBX9FLsHpYW3Q8I1FFLHoHXl_728/view?usp=sharing)
   as the latest stable version, which includes the necessary fixes.
 * Please update to 4.0.1 and try configuring the fallback SMTP again. You should
   no longer encounter the “Outgoing Mail Server Hostname and Port cannot be empty”
   error when enabling or disabling the fallback option.
 * We apologize for the confusion caused by the unintended beta release, and appreciate
   you reporting the issue.
 * If you continue to face issue after updating to v 4.0.1, We are here to assist
   you.
 *  Thread Starter [vurvargurgar](https://wordpress.org/support/users/vurvargurgar/)
 * (@vurvargurgar)
 * [1 week, 5 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/#post-19002138)
 * Why is the stable version not just being pushed as a regular update through your
   release channel instead of pointing users to download as a zip outside of the
   wordpress environment?
 *  Plugin Support [mubashirbutt](https://wordpress.org/support/users/mubashirbutt/)
 * (@mubashirbutt)
 * [1 week, 5 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/#post-19002188)
 * Hello [@vurvargurgar](https://wordpress.org/support/users/vurvargurgar/) ,
 * We completely understand your concern. The 4.0.1 release has already been submitted
   and released from our side through the standard WordPress.org release process.
 * One point worth mentioning is that _WordPress.org’s plugin distribution/update
   system can take several hours to propagate a newly released version to all sites_.
   As a result, 4.0.1 may not become available immediately for every installation
   after the release. We’re monitoring the rollout and working to ensure the corrected
   version reaches affected sites as quickly as possible.
 * Again, we’re sorry for the disruption caused by the unintended beta release, 
   and we appreciate you bringing this compatibility issue to our attention.
 *  Plugin Support [mubashirbutt](https://wordpress.org/support/users/mubashirbutt/)
 * (@mubashirbutt)
 * [1 week, 5 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/#post-19002650)
 * Hello [@vurvargurgar](https://wordpress.org/support/users/vurvargurgar/) ,
 * The updated release is now available. Please update the plugin to the latest 
   version and check the issue again.
 * If you still encounter the same issue after updating, please let us know.

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

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 * ![](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)
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 * 6 replies
 * 3 participants
 * Last reply from: [mubashirbutt](https://wordpress.org/support/users/mubashirbutt/)
 * Last activity: [1 week, 5 days ago](https://wordpress.org/support/topic/version-4-0-0-beta-1-issues/#post-19002650)
 * Status: resolved