Title: PHP8.4/8.5 Compatibility
Last modified: October 13, 2026

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# PHP8.4/8.5 Compatibility

 *  [nimonogi](https://wordpress.org/support/users/nimonogi/)
 * (@nimonogi)
 * [20 hours, 38 minutes ago](https://wordpress.org/support/topic/php8-4-8-5-compatibility/)
 * AmazonSES plugin is not compatible with PHP8.4/8.5. Here is the solutiuon: What
   I changed in the zip
 * default; is now default:.
   Every implicit-nullable parameter in the SDK and Guzzle
   now has an explicit ?, for example callable $handler = null became ?callable 
   $handler = null.Nothing else was touched.
 * Still left in your log
 * The backtick operator deprecation is in Mailster core (cron.class.php line 426),
   not this add-on. It needs a Mailster update.
   The BounceHandler::$first_body_hash
   dynamic-property notices are also in Mailster core.

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [Xaver](https://wordpress.org/support/users/xaverb/)
 * (@xaverb)
 * [8 hours, 14 minutes ago](https://wordpress.org/support/topic/php8-4-8-5-compatibility/#post-19044179)
 * Hi nimonogi!
   Thanks for reporting this issue! We are working on a fix and will
   ship it soon!Best RegardsXaver

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 2 participants
 * Last reply from: [Xaver](https://wordpress.org/support/users/xaverb/)
 * Last activity: [8 hours, 14 minutes ago](https://wordpress.org/support/topic/php8-4-8-5-compatibility/#post-19044179)
 * Status: not resolved