Title: wp_mail pluggable function
Last modified: August 31, 2022

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# wp_mail pluggable function

 *  Resolved [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * (@caban13)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/)
 * Hi
 * Today I m getting the following alert:
 * The FluentSMTP plugin depends on wp_mail pluggable function and plugin is not
   able to extend it. Please check if another plugin is using this and disable it
   for FluentSMTP to work!
 * Possible Conflict: /home/xxx/public_html/example.com/wp-includes/pluggable.php:
   182
 * Yesterday WP was updated, but I don’t think that’s the culprit, I just reinstalled
   it…
 * Any hint ?
 * Alain

Viewing 8 replies - 1 through 8 (of 8 total)

 *  [Pieter Sand](https://wordpress.org/support/users/beachholiday/)
 * (@beachholiday)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15969462)
 * Dear Support,
 * We are seeing the same error message:
    [https://i.imgur.com/ZpfPjV8.png](https://i.imgur.com/ZpfPjV8.png)
 * In our case it also appeared after yesterday’s update and we did not change any
   plugins, e.g. add a new one, de-activate / activate plugins, etc.
 * We suspect that it has something to do with the Fluent SMTP update itself.
 * Please investigate.
 * Many thanks,
 * Piet
 *  Thread Starter [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * (@caban13)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15970077)
 * Last update of FluentSMTP plugin was 2 weeks ago, so it is something else … Yesterday
   WP was updated, I rolled it back and the problem remained.
 *  [Pieter Sand](https://wordpress.org/support/users/beachholiday/)
 * (@beachholiday)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15972133)
 * Hi [@caban13](https://wordpress.org/support/users/caban13/)
 * You raise very good points.
 * Just to clarify, you rolled back the last FluentSMTP or yesterday’s WordPress
   update?
 * I suspect you rolled back the FluentSMTP update but kept the WordPress update
   and still the problem persisted, i.e. the WP update appears to be the cause.
 * Did I understand you correctly?
 * Piet
 *  Thread Starter [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * (@caban13)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15972715)
 * Hi
 * I rolled back the last FluentSMTP and last WordPress, in one at a time and both
   together, the problem always persisted.
 * Really, I suspect of a different plugin causing this… I only raised this because
   FluentSMTP is mentioned in the alert.
 * Thanks
 *  Plugin Support [Amimul Ihsan](https://wordpress.org/support/users/amimulihsanmahdi/)
 * (@amimulihsanmahdi)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15973123)
 * Hello [@caban13](https://wordpress.org/support/users/caban13/),
 * It seems like the default wp_mail function is getting blocked on your website.
   Can you please check if there are any other SMTP plugins installed on your website?
   If so, kindly deactivate them and hopefully, the issue will be resolved.
 * If this is not the case, then there are other conflicts that block the wp_mail
   function. I would recommend you to contact the hosting provider regarding the
   issue.
 * Thank you
 *  Thread Starter [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * (@caban13)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15973676)
 * As I said before: “I only raised this (ticket) because FluentSMTP is mentioned
   in the alert.” … I already know who is the culprit, I am waiting for the fix.
 * It is time to close this ticket.
 *  [Pieter Sand](https://wordpress.org/support/users/beachholiday/)
 * (@beachholiday)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15976203)
 * Dear [@amimulihsanmahdi](https://wordpress.org/support/users/amimulihsanmahdi/)
 * In our case the culprit were the plugins ‘Booster for WooCommerce’ and the premium
   add-on ‘Booster Plus for WooCommerce’.
 * The fix by the plugin author is offered in this thread:
    [https://wordpress.org/support/topic/critical-email-error-after-update-to-5-6-1/](https://wordpress.org/support/topic/critical-email-error-after-update-to-5-6-1/)
 * Many thanks for your help.
 * Piet
 *  Thread Starter [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * (@caban13)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15976232)
 * Thanks [@beachholiday](https://wordpress.org/support/users/beachholiday/)
    Already
   sorted…

Viewing 8 replies - 1 through 8 (of 8 total)

The topic ‘wp_mail pluggable function’ is closed to new replies.

 * ![](https://ps.w.org/fluent-smtp/assets/icon.svg?rev=2458343)
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 * 8 replies
 * 3 participants
 * Last reply from: [Alain Aubry](https://wordpress.org/support/users/caban13/)
 * Last activity: [3 years, 9 months ago](https://wordpress.org/support/topic/wp_mail-pluggable-function/#post-15976232)
 * Status: resolved