diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index a34b0cf8..303f0179 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -1165,21 +1165,6 @@ parameters:
 			count: 1
 			path: src/Repository/Carrier/BaseCarrier.php
 
-		-
-			message: "#^Argument of an invalid type mixed supplied for foreach, only iterables are supported\\.$#"
-			count: 1
-			path: src/Repository/Carrier/Email.php
-
-		-
-			message: "#^Cannot access offset 'key' on mixed\\.$#"
-			count: 1
-			path: src/Repository/Carrier/Email.php
-
-		-
-			message: "#^Cannot access offset 'value' on mixed\\.$#"
-			count: 1
-			path: src/Repository/Carrier/Email.php
-
 		-
 			message: "#^Parameter \\#1 \\$carrier of static method BracketSpace\\\\Notification\\\\Register\\:\\:carrier\\(\\) expects BracketSpace\\\\Notification\\\\Interfaces\\\\Sendable, mixed given\\.$#"
 			count: 3
diff --git a/src/Admin/Settings.php b/src/Admin/Settings.php
index 0109f9c9..66593dd8 100644
--- a/src/Admin/Settings.php
+++ b/src/Admin/Settings.php
@@ -10,6 +10,7 @@
 
 namespace BracketSpace\Notification\Admin;
 
+use BracketSpace\Notification\Repository\Carrier\Email;
 use BracketSpace\Notification\Utils\Settings\CoreFields;
 use BracketSpace\Notification\Utils\WpObjectHelper;
 
@@ -356,17 +357,6 @@ public function triggersSettings($settings)
 	 */
 	public function carriersSettings($settings)
 	{
-		if (!empty($_SERVER['SERVER_NAME'])) {
-			$sitename = strtolower(sanitize_text_field(wp_unslash($_SERVER['SERVER_NAME'])));
-			if (substr($sitename, 0, 4) === 'www.') {
-				$sitename = substr($sitename, 4);
-			}
-		} else {
-			$sitename = 'example.com';
-		}
-
-		$defaultFromEmail = 'wordpress@' . $sitename;
-
 		$carriers = $settings->addSection(__('Carriers', 'notification'), 'carriers');
 
 		$carriers->addGroup(__('Email', 'notification'), 'email')
@@ -423,7 +413,7 @@ public function carriersSettings($settings)
 					'description' => sprintf(
 						// Translators: %s default value.
 						__('Leave blank to use default value: %s', 'notification'),
-						'<code>WordPress</code>'
+						'<code>' . Email::getDefaultFromName() . '</code>'
 					),
 				]
 			)
@@ -437,7 +427,7 @@ public function carriersSettings($settings)
 					'description' => sprintf(
 						// Translators: %s default value.
 						__('Leave blank to use default value: %s', 'notification'),
-						'<code>' . $defaultFromEmail . '</code>'
+						'<code>' . Email::getDefaultFromEmail() . '</code>'
 					),
 				]
 			)
diff --git a/src/Repository/Carrier/Email.php b/src/Repository/Carrier/Email.php
index b1bf8281..06f4f859 100644
--- a/src/Repository/Carrier/Email.php
+++ b/src/Repository/Carrier/Email.php
@@ -40,6 +40,36 @@ public function __construct()
 		);
 	}
 
+	/**
+	 * Gets the default name for "From" header.
+	 *
+	 * @return  string
+	 */
+	public static function getDefaultFromName(): string
+	{
+		return 'WordPress';
+	}
+
+	/**
+	 * Gets the default email for "From" header.
+	 *
+	 * @return  string
+	 */
+	public static function getDefaultFromEmail(): string
+	{
+		if (!empty($_SERVER['SERVER_NAME'])) {
+			$sitename = strtolower(sanitize_text_field(wp_unslash($_SERVER['SERVER_NAME'])));
+
+			if (substr($sitename, 0, 4) === 'www.') {
+				$sitename = substr($sitename, 4);
+			}
+		} else {
+			$sitename = 'example.com';
+		}
+
+		return 'wordpress@' . $sitename;
+	}
+
 	/**
 	 * Used to register Carrier form fields
 	 * Uses $this->addFormField();
@@ -169,23 +199,8 @@ public function send(Triggerable $trigger)
 			$message = ' ';
 		}
 
-		$headers = [];
+		$headers = apply_filters('notification/carrier/email/headers', $this->getHeaders(), $this, $trigger);
 
-		$fromHeader = $this->getFromHeaderSetting();
-		if ($fromHeader) {
-			$headers[] = $fromHeader;
-		}
-
-		if (
-			\Notification::settings()->getSetting('carriers/email/headers') &&
-			! empty($data['headers'])
-		) {
-			foreach ($data['headers'] as $header) {
-				$headers[] = $header['key'] . ': ' . $header['value'];
-			}
-		}
-
-		$headers = apply_filters('notification/carrier/email/headers', $headers, $this, $trigger);
 		$attachments = apply_filters('notification/carrier/email/attachments', [], $this, $trigger);
 
 		$errors = [];
@@ -253,17 +268,63 @@ public function allowUnfilteredHtmlBody($carrierData, $rawData)
 	}
 
 	/**
-	 * Retrieve email "From" header from settings.
+	 * Gets the list of headers.
 	 *
-	 * @return string
+	 * @return  array<string>
 	 */
-	protected function getFromHeaderSetting()
+	protected function getHeaders(): array
+	{
+		$headers = $this->getCarrierHeaders();
+		$headers['from'] ??= $this->getDefaultFromHeader();
+
+		return array_map(
+			static function ($value, $key) {
+				return sprintf('%s: %s', $key, $value);
+			},
+			array_values($headers),
+			array_keys($headers)
+		);
+	}
+
+	/**
+	 * Gets organized list of carrier headers.
+	 *
+	 * @return  array<string, string>
+	 */
+	protected function getCarrierHeaders(): array
+	{
+		if (!\Notification::settings()->getSetting('carriers/email/headers')) {
+			return [];
+		}
+
+		$data = is_array($this->data['headers'] ?? null) ? $this->data['headers'] : [];
+		$headers = [];
+
+		foreach ($data as $header) {
+			if (!is_array($header) || !is_string($header['key'] ?? null) || !is_string($header['value'] ?? null)) {
+				continue;
+			}
+
+			$headers[strtolower($header['key'])] = $header['value'];
+		}
+
+		return array_filter($headers);
+	}
+
+	/**
+	 * Gets the default "From" header value.
+	 *
+	 * @return  string
+	 */
+	protected function getDefaultFromHeader(): string
 	{
-		/** @var string $fromName */
-		$fromName = \Notification::settings()->getSetting('carriers/email/from_name');
-		/** @var string $fromEmail */
 		$fromEmail = \Notification::settings()->getSetting('carriers/email/from_email');
+		$fromName = \Notification::settings()->getSetting('carriers/email/from_name');
 
-		return sprintf('From: %s <%s>', $fromName, $fromEmail);
+		return sprintf(
+			'%s <%s>',
+			is_string($fromName) && strlen($fromName) ? $fromName : self::getDefaultFromName(),
+			is_string($fromEmail) && strlen($fromEmail) ? $fromEmail : self::getDefaultFromEmail()
+		);
 	}
 }