Title: Plugin conflict/errors with “Post SMTP”
Last modified: August 6, 2021

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# Plugin conflict/errors with “Post SMTP”

 *  Resolved [pkanel](https://wordpress.org/support/users/pkanel/)
 * (@pkanel)
 * [5 years ago](https://wordpress.org/support/topic/plugin-conflict-errors-with-post-smtp/)
 * Your plugin has conflict with popular plugin “Post SMTP” and when we enable wp-
   optimize we got the following error in every loading page.
 * AH01071: Got error ‘PHP message: FATAL Postman: Postman: wp_mail has been declared
   by another plugin or theme, so you won’t be able to use Postman until the conflict
   is resolved.’
 * Please fix it!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Harshad](https://wordpress.org/support/users/bornforphp/)
 * (@bornforphp)
 * [5 years ago](https://wordpress.org/support/topic/plugin-conflict-errors-with-post-smtp/#post-14746999)
 * [@pkanel](https://wordpress.org/support/users/pkanel/) Yes this is a known issue
   and we are working on it, hopefully it should get fixed in future release.
 *  Thread Starter [pkanel](https://wordpress.org/support/users/pkanel/)
 * (@pkanel)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-errors-with-post-smtp/#post-14908274)
 * Hi [@harshad](https://wordpress.org/support/users/harshad/) , any update? So 
   many errors 24/7, causing delays to server.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Plugin conflict/errors with “Post SMTP”’ is closed to new replies.

 * ![](https://ps.w.org/wp-optimize/assets/icon-256x256.png?rev=1552899)
 * [WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance](https://wordpress.org/plugins/wp-optimize/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-optimize/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-optimize/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-optimize/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-optimize/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-optimize/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [pkanel](https://wordpress.org/support/users/pkanel/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/plugin-conflict-errors-with-post-smtp/#post-14908274)
 * Status: resolved