Title: Pluggable
Last modified: December 1, 2017

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# Pluggable

 *  [aggk](https://wordpress.org/support/users/aggk/)
 * (@aggk)
 * [8 years, 6 months ago](https://wordpress.org/support/topic/pluggable-2/)
 * Hi,
 * We need to place a file inside our “mu-plugins” -folder with a function that 
   calls pluggable.php
    However this creates a conflict with Post SMTP. The following
   message is shown in backend panel: “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.”
 * Grateful for help with this, thanks!

Viewing 1 replies (of 1 total)

 *  [yehudah](https://wordpress.org/support/users/yehudah/)
 * (@yehudah)
 * [8 years, 6 months ago](https://wordpress.org/support/topic/pluggable-2/#post-9744362)
 * Hi [@aggk](https://wordpress.org/support/users/aggk/),
 * Why include pluggable.php?
    if you need a function just copy it. it’s bad practice
   to include the file, it will cause a lot of conflicts with any plugin trying 
   to override a function that exists on pluggable.php

Viewing 1 replies (of 1 total)

The topic ‘Pluggable’ 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/)
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 * 1 reply
 * 2 participants
 * Last reply from: [yehudah](https://wordpress.org/support/users/yehudah/)
 * Last activity: [8 years, 6 months ago](https://wordpress.org/support/topic/pluggable-2/#post-9744362)
 * Status: not resolved