mailhog

mu-plugins/mailhog.php

@@ -0,0 +1,21 @@
+<?php
+/**
+ * Route all outgoing mail through the local mailhog service (see devenv.nix)
+ * instead of actually sending it. View caught mail at http://localhost:8025.
+ */
+
+add_action(
+	'phpmailer_init',
+	function ( $phpmailer ) {
+		$phpmailer->isSMTP();
+		$phpmailer->Host       = '127.0.0.1';
+		$phpmailer->Port       = 1025;
+		$phpmailer->SMTPAuth   = false;
+		$phpmailer->SMTPAutoTLS = false;
+	}
+);
+
+// WordPress defaults the From address to "wordpress@localhost" in this
+// environment, which PHPMailer rejects as invalid (no dot in the domain),
+// causing wp_mail() to fail before it ever reaches mailhog.
+add_filter( 'wp_mail_from', fn() => 'wordpress@wp-devenv.test' );