Title: Plugin not working-declared by another plugin
Last modified: August 30, 2016

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# Plugin not working-declared by another plugin

 *  [abhivjvm](https://wordpress.org/support/users/abhivjvm/)
 * (@abhivjvm)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/)
 * 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.
 * A few days back it was working fine but now I am getting this message on my dashboard…
   I read the support forum and did the diagnostic test, pluggable.php is the file,
   but i dont know how to resolve it
 * [https://wordpress.org/plugins/postman-smtp/](https://wordpress.org/plugins/postman-smtp/)

Viewing 6 replies - 16 through 21 (of 21 total)

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 *  [Plugins Area](https://wordpress.org/support/users/usersultra/)
 * (@usersultra)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263666)
 * Hey guys,
 * This issue has been resolved.
 * Could you please update your plugin and let us know?
 * Cheers
    Adrian
 *  Plugin Author [Jason Hendriks](https://wordpress.org/support/users/jasonhendriks/)
 * (@jasonhendriks)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263668)
 * Wrong thread, **AIO Support Center** Still has this problem.
 *  [mirohristov](https://wordpress.org/support/users/mirohristov/)
 * (@mirohristov)
 * [10 years, 7 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263703)
 * Just wanted to add a quick way to scan for plugins that use pluggable.
 * Use the following linux command in the wp root directory (or change . to /path/)
 * `find ./wp-content -name \*.php | xargs grep "/pluggable.php"`
 * You’ll get a list of all plugins using pluggable.php
 * >  ./wp-content/plugins/automatic-domain-changer/auto-domain-change.php: require_once(
   > ABSPATH .’wp-includes/pluggable.php’);
 * In my case it was only **Automatic Domain Changer** that used it and caused it.
 * Disabled it and it worked fine.
 * Thanks eveyone!
 *  Plugin Author [Jason Hendriks](https://wordpress.org/support/users/jasonhendriks/)
 * (@jasonhendriks)
 * [10 years, 7 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263704)
 *     ```
       grep -R pluggable ./wp-content/*
       ```
   
 *  [lirael_aborsen](https://wordpress.org/support/users/lirael_aborsen/)
 * (@lirael_aborsen)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263733)
 * Hello
 * I have similar problem.
    “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.”
   error in the admin panel. So, I’ve read this thread and figured out the compatibility
   problem. And I’ve figured out what this plugin is (our payment gateway). It really
   was declaring “require_once( ABSPATH . “wp-includes/pluggable.php” );” I’ve found
   it and deleted, and no other files in the plugin have it. But, I still have the
   same error in the admin panel. When I disable payment gateway plugin, Postman
   smtp works perfectly.
 * Do you have any other ideas what may cause the compatibility issue?
 * Thanks.
 *  [Mkom](https://wordpress.org/support/users/mkom/)
 * (@mkom)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263742)
 * I have a similar issue with Postman and a plugin called “content-modal”: “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.”
 * Is there a chance to resolve that if I send you the (quite small) plugin?

Viewing 6 replies - 16 through 21 (of 21 total)

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The topic ‘Plugin not working-declared by another plugin’ is closed to new replies.

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## Tags

 * [wp_mail bound](https://wordpress.org/support/topic-tag/wp_mail-bound/)

 * 21 replies
 * 6 participants
 * Last reply from: [Mkom](https://wordpress.org/support/users/mkom/)
 * Last activity: [9 years, 10 months ago](https://wordpress.org/support/topic/plugin-not-working-declared-by-another-plugin/page/2/#post-6263742)
 * Status: not a support question