diff --git a/src/App.php b/src/App.php
index 27eaf100f4..abad4ee35d 100644
--- a/src/App.php
+++ b/src/App.php
@@ -27,6 +27,7 @@ use Friendica\App\BaseURL;
 use Friendica\Capabilities\ICanCreateResponses;
 use Friendica\Core\Config\Factory\Config;
 use Friendica\Core\Session\Capability\IHandleUserSessions;
+use Friendica\Model\User;
 use Friendica\Module\Maintenance;
 use Friendica\Security\Authentication;
 use Friendica\Core\Config\ValueObject\Cache;
@@ -164,14 +165,16 @@ class App
 	 * Check if current user has admin role.
 	 *
 	 * @return bool true if user is an admin
+	 * @throws Exception
 	 */
 	public function isSiteAdmin(): bool
 	{
-		$admin_email = $this->config->get('config', 'admin_email');
-
-		$adminlist = explode(',', str_replace(' ', '', $admin_email));
-
-		return $this->session->getLocalUserId() && $admin_email && $this->database->exists('user', ['uid' => $this->getLoggedInUserId(), 'email' => $adminlist]);
+		return
+			$this->session->getLocalUserId()
+			&& $this->database->exists('user', [
+				'uid'   => $this->getLoggedInUserId(),
+				'email' => User::getAdminEmailList()
+			]);
 	}
 
 	/**
@@ -259,8 +262,8 @@ class App
 	/**
 	 * Set workerqueue information
 	 *
-	 * @param array $queue 
-	 * @return void 
+	 * @param array $queue
+	 * @return void
 	 */
 	public function setQueue(array $queue)
 	{
diff --git a/src/Core/Update.php b/src/Core/Update.php
index 5f42517209..8ec96dc989 100644
--- a/src/Core/Update.php
+++ b/src/Core/Update.php
@@ -26,6 +26,7 @@ use Friendica\App\Mode;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
+use Friendica\Model\User;
 use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Util\DateTimeFormat;
 use Friendica\Util\Strings;
@@ -148,7 +149,7 @@ class Update
 					}
 
 					DI::config()->set('system', 'maintenance', 1);
-		
+
 					// run the pre_update_nnnn functions in update.php
 					for ($version = $stored + 1; $version <= $current; $version++) {
 						Logger::notice('Execute pre update.', ['version' => $version]);
@@ -289,30 +290,16 @@ class Update
 	 * @return void
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	private static function updateFailed(int $update_id, string $error_message) {
-		//send the administrators an e-mail
-		$condition = ['email' => explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email'))), 'parent-uid' => 0];
-		$adminlist = DBA::select('user', ['uid', 'language', 'email'], $condition, ['order' => ['uid']]);
-
-		// No valid result?
-		if (!DBA::isResult($adminlist)) {
+	private static function updateFailed(int $update_id, string $error_message)
+	{
+		$adminEmails = User::getAdminListForEmailing(['uid', 'language', 'email']);
+		if (!$adminEmails) {
 			Logger::warning('Cannot notify administrators .', ['update' => $update_id, 'message' => $error_message]);
-
-			// Don't continue
 			return;
 		}
 
-		$sent = [];
-
-		// every admin could had different language
-		while ($admin = DBA::fetch($adminlist)) {
-			if (in_array($admin['email'], $sent)) {
-				continue;
-			}
-			$sent[] = $admin['email'];
-
-			$lang = $admin['language'] ?? 'en';
-			$l10n = DI::l10n()->withLang($lang);
+		foreach($adminEmails as $admin) {
+			$l10n = DI::l10n()->withLang($admin['language'] ?: 'en');
 
 			$preamble = Strings::deindent($l10n->t("
 				The friendica developers released update %s recently,
@@ -343,35 +330,20 @@ class Update
 	 */
 	private static function updateSuccessful(int $from_build, int $to_build)
 	{
-		//send the administrators an e-mail
-		$condition = ['email' => explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email'))), 'parent-uid' => 0];
-		$adminlist = DBA::select('user', ['uid', 'language', 'email'], $condition, ['order' => ['uid']]);
+		foreach(User::getAdminListForEmailing(['uid', 'language', 'email']) as $admin) {
+			$l10n = DI::l10n()->withLang($admin['language'] ?: 'en');
 
-		if (DBA::isResult($adminlist)) {
-			$sent = [];
+			$preamble = Strings::deindent($l10n->t('
+				The friendica database was successfully updated from %s to %s.',
+				$from_build, $to_build));
 
-			// every admin could had different language
-			while ($admin = DBA::fetch($adminlist)) {
-				if (in_array($admin['email'], $sent)) {
-					continue;
-				}
-				$sent[] = $admin['email'];
-
-				$lang = (($admin['language']) ? $admin['language'] : 'en');
-				$l10n = DI::l10n()->withLang($lang);
-
-				$preamble = Strings::deindent($l10n->t('
-					The friendica database was successfully updated from %s to %s.',
-					$from_build, $to_build));
-
-				$email = DI::emailer()
-					->newSystemMail()
-					->withMessage($l10n->t('[Friendica Notify] Database update'), $preamble)
-					->forUser($admin)
-					->withRecipient($admin['email'])
-					->build();
-				DI::emailer()->send($email);
-			}
+			$email = DI::emailer()
+				->newSystemMail()
+				->withMessage($l10n->t('[Friendica Notify] Database update'), $preamble)
+				->forUser($admin)
+				->withRecipient($admin['email'])
+				->build();
+			DI::emailer()->send($email);
 		}
 
 		Logger::debug('Database structure update successful.');
diff --git a/src/Model/Nodeinfo.php b/src/Model/Nodeinfo.php
index 9a4d2bd60f..b10572612d 100644
--- a/src/Model/Nodeinfo.php
+++ b/src/Model/Nodeinfo.php
@@ -164,25 +164,16 @@ class Nodeinfo
 	 *
 	 * @param IManageConfigValues $config Configuration instance
 	 * @return array Organization information
+	 * @throws \Exception
 	 */
 	public static function getOrganization(IManageConfigValues $config): array
 	{
-		$organization = [
-			'name' => null,
-			'contact' => null,
-			'account' => null
+		$administrator = User::getFirstAdmin(['username', 'email', 'nickname']);
+
+		return [
+			'name'    => $administrator['username'] ?? null,
+			'contact' => $administrator['email']    ?? null,
+			'account' => $administrator['nickname'] ?? '' ? DI::baseUrl()->get() . '/profile/' . $administrator['nickname'] : null,
 		];
-
-		if (!empty($config->get('config', 'admin_email'))) {
-			$adminList = explode(',', str_replace(' ', '', $config->get('config', 'admin_email')));
-			$organization['contact'] = $adminList[0];
-			$administrator = User::getByEmail($adminList[0], ['username', 'nickname']);
-			if (!empty($administrator)) {
-				$organization['name'] = $administrator['username'];
-				$organization['account'] = DI::baseUrl()->get() . '/profile/' . $administrator['nickname'];
-			}
-		}
-
-		return $organization;
 	}
 }
diff --git a/src/Model/User.php b/src/Model/User.php
index cc6e11a42d..73c380561c 100644
--- a/src/Model/User.php
+++ b/src/Model/User.php
@@ -381,17 +381,15 @@ class User
 	 *
 	 * @param array $fields
 	 * @return array user
+	 * @throws Exception
 	 */
 	public static function getFirstAdmin(array $fields = []) : array
 	{
 		if (!empty(DI::config()->get('config', 'admin_nickname'))) {
 			return self::getByNickname(DI::config()->get('config', 'admin_nickname'), $fields);
-		} elseif (!empty(DI::config()->get('config', 'admin_email'))) {
-			$adminList = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
-			return self::getByEmail($adminList[0], $fields);
-		} else {
-			return [];
 		}
+
+		return self::getAdminList()[0] ?? [];
 	}
 
 	/**
@@ -1054,11 +1052,8 @@ class User
 
 		// Disallow somebody creating an account using openid that uses the admin email address,
 		// since openid bypasses email verification. We'll allow it if there is not yet an admin account.
-		if (DI::config()->get('config', 'admin_email') && strlen($openid_url)) {
-			$adminlist = explode(',', str_replace(' ', '', strtolower(DI::config()->get('config', 'admin_email'))));
-			if (in_array(strtolower($email), $adminlist)) {
-				throw new Exception(DI::l10n()->t('Cannot use that email.'));
-			}
+		if (strlen($openid_url) && in_array(strtolower($email), self::getAdminEmailList())) {
+			throw new Exception(DI::l10n()->t('Cannot use that email.'));
 		}
 
 		$nickname = $data['nickname'] = strtolower($nickname);
@@ -1783,4 +1778,64 @@ class User
 
 		return DBA::selectToArray('owner-view', [], $condition, $param);
 	}
+
+	/**
+	 * Returns a list of lowercase admin email addresses from the comma-separated list in the config
+	 *
+	 * @return array
+	 */
+	public static function getAdminEmailList(): array
+	{
+		$adminEmails = strtolower(str_replace(' ', '', DI::config()->get('config', 'admin_email')));
+		if (!$adminEmails) {
+			return [];
+		}
+
+		return explode(',', $adminEmails);
+	}
+
+	/**
+	 * Returns the complete list of admin user accounts
+	 *
+	 * @param array $fields
+	 * @return array
+	 * @throws Exception
+	 */
+	public static function getAdminList(array $fields = []): array
+	{
+		$condition = [
+			'email'           => self::getAdminEmailList(),
+			'parent-uid'      => 0,
+			'blocked'         => 0,
+			'verified'        => true,
+			'account_removed' => false,
+			'account_expired' => false,
+		];
+
+		return DBA::selectToArray('user', $fields, $condition, ['order' => ['uid']]);
+	}
+
+	/**
+	 * Return a list of admin user accounts where each unique email address appears only once.
+	 *
+	 * This method is meant for admin notifications that do not need to be sent multiple times to the same email address.
+	 *
+	 * @param array $fields
+	 * @return array
+	 * @throws Exception
+	 */
+	public static function getAdminListForEmailing(array $fields = []): array
+	{
+		return array_filter(self::getAdminList($fields), function ($user) {
+			static $emails = [];
+
+			if (in_array($user['email'], $emails)) {
+				return false;
+			}
+
+			$emails[] = $user['email'];
+
+			return true;
+		});
+	}
 }
diff --git a/src/Module/Api/GNUSocial/GNUSocial/Config.php b/src/Module/Api/GNUSocial/GNUSocial/Config.php
index 8b38ca8967..ed27b8ef3a 100644
--- a/src/Module/Api/GNUSocial/GNUSocial/Config.php
+++ b/src/Module/Api/GNUSocial/GNUSocial/Config.php
@@ -23,6 +23,7 @@ namespace Friendica\Module\Api\GNUSocial\GNUSocial;
 
 use Friendica\App;
 use Friendica\DI;
+use Friendica\Model\User;
 use Friendica\Module\BaseApi;
 use Friendica\Module\Register;
 
@@ -42,7 +43,7 @@ class Config extends BaseApi
 				'logo'         => DI::baseUrl() . '/images/friendica-64.png',
 				'fancy'        => true,
 				'language'     => DI::config()->get('system', 'language'),
-				'email'        => DI::config()->get('config', 'admin_email'),
+				'email'        => implode(',', User::getAdminEmailList()),
 				'broughtby'    => '',
 				'broughtbyurl' => '',
 				'timezone'     => DI::config()->get('system', 'default_timezone'),
diff --git a/src/Module/Moderation/BaseUsers.php b/src/Module/Moderation/BaseUsers.php
index eddfc09097..b780277646 100644
--- a/src/Module/Moderation/BaseUsers.php
+++ b/src/Module/Moderation/BaseUsers.php
@@ -113,7 +113,7 @@ abstract class BaseUsers extends BaseModeration
 
 	protected function setupUserCallback(): \Closure
 	{
-		$adminlist = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
+		$adminlist = User::getAdminEmailList();
 		return function ($user) use ($adminlist) {
 			$page_types = [
 				User::PAGE_FLAGS_NORMAL    => $this->t('Normal Account Page'),
diff --git a/src/Module/Register.php b/src/Module/Register.php
index ad3e1feeac..b71fb777c5 100644
--- a/src/Module/Register.php
+++ b/src/Module/Register.php
@@ -352,7 +352,7 @@ class Register extends BaseModule
 				DI::baseUrl()->redirect();
 			}
 		} elseif (intval(DI::config()->get('config', 'register_policy')) === self::APPROVE) {
-			if (!strlen(DI::config()->get('config', 'admin_email'))) {
+			if (!User::getAdminEmailList()) {
 				DI::sysmsg()->addNotice(DI::l10n()->t('Your registration can not be processed.'));
 				DI::baseUrl()->redirect();
 			}
@@ -387,34 +387,23 @@ class Register extends BaseModule
 			DI::sysmsg()->addInfo(DI::l10n()->t('Your registration is pending approval by the site owner.'));
 			DI::baseUrl()->redirect();
 		}
-
-		return;
 	}
 
 	private function sendNotification(array $user, string $event)
 	{
-		// send email to admins
-		$admins_stmt = DBA::select(
-			'user',
-			['uid', 'language', 'email'],
-			['email' => explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')))]
-		);
-
-		// send notification to admins
-		while ($admin = DBA::fetch($admins_stmt)) {
+		foreach (User::getAdminListForEmailing(['uid', 'language', 'email']) as $admin) {
 			DI::notify()->createFromArray([
-				'type'         => Model\Notification\Type::SYSTEM,
-				'event'        => $event,
-				'uid'          => $admin['uid'],
-				'link'         => DI::baseUrl()->get(true) . '/moderation/users/',
-				'source_name'  => $user['username'],
-				'source_mail'  => $user['email'],
-				'source_nick'  => $user['nickname'],
-				'source_link'  => DI::baseUrl()->get(true) . '/moderation/users/',
-				'source_photo' => User::getAvatarUrl($user, Proxy::SIZE_THUMB),
+				'type'                      => Model\Notification\Type::SYSTEM,
+				'event'                     => $event,
+				'uid'                       => $admin['uid'],
+				'link'                      => DI::baseUrl()->get(true) . '/moderation/users/',
+				'source_name'               => $user['username'],
+				'source_mail'               => $user['email'],
+				'source_nick'               => $user['nickname'],
+				'source_link'               => DI::baseUrl()->get(true) . '/moderation/users/',
+				'source_photo'              => User::getAvatarUrl($user, Proxy::SIZE_THUMB),
 				'show_in_notification_page' => false
 			]);
 		}
-		DBA::close($admins_stmt);		
 	}
 }
diff --git a/src/Module/Settings/Account.php b/src/Module/Settings/Account.php
index c9b140acb3..4217b1e88d 100644
--- a/src/Module/Settings/Account.php
+++ b/src/Module/Settings/Account.php
@@ -113,12 +113,9 @@ class Account extends BaseSettings
 					$err .= DI::l10n()->t('Invalid email.');
 				}
 				//  ensure new email is not the admin mail
-				if (DI::config()->get('config', 'admin_email')) {
-					$adminlist = explode(",", str_replace(" ", "", strtolower(DI::config()->get('config', 'admin_email'))));
-					if (in_array(strtolower($email), $adminlist)) {
-						$err .= DI::l10n()->t('Cannot change to that email.');
-						$email = $user['email'];
-					}
+				if (in_array(strtolower($email), User::getAdminEmailList())) {
+					$err .= DI::l10n()->t('Cannot change to that email.');
+					$email = $user['email'];
 				}
 			}
 
diff --git a/src/Module/Settings/RemoveMe.php b/src/Module/Settings/RemoveMe.php
index 87bc6152a5..32dffd156f 100644
--- a/src/Module/Settings/RemoveMe.php
+++ b/src/Module/Settings/RemoveMe.php
@@ -85,14 +85,8 @@ class RemoveMe extends BaseSettings
 		}
 
 		// send notification to admins so that they can clean up the backups
-		$admin_mails = explode(',', $this->config->get('config', 'admin_email'));
-		foreach ($admin_mails as $mail) {
-			$admin = $this->database->selectFirst('user', ['uid', 'language', 'email', 'username'], ['email' => trim($mail)]);
-			if (!$admin) {
-				continue;
-			}
-
-			$l10n = $this->l10n->withLang($admin['language']);
+		foreach (User::getAdminListForEmailing(['uid', 'language', 'email']) as $admin) {
+			$l10n = $this->l10n->withLang($admin['language'] ?: 'en');
 
 			$email = $this->emailer
 				->newSystemMail()
diff --git a/src/Object/Api/Mastodon/Instance.php b/src/Object/Api/Mastodon/Instance.php
index 45fc4bf895..b659dc3063 100644
--- a/src/Object/Api/Mastodon/Instance.php
+++ b/src/Object/Api/Mastodon/Instance.php
@@ -86,7 +86,7 @@ class Instance extends BaseDataTransferObject
 		$this->uri               = $baseUrl->get();
 		$this->title             = $config->get('config', 'sitename');
 		$this->short_description = $this->description = $config->get('config', 'info');
-		$this->email             = $config->get('config', 'admin_email');
+		$this->email             = implode(',', User::getAdminEmailList());
 		$this->version           = '2.8.0 (compatible; Friendica ' . App::VERSION . ')';
 		$this->urls              = null; // Not supported
 		$this->stats             = new Stats($config, $database);
@@ -98,13 +98,10 @@ class Instance extends BaseDataTransferObject
 		$this->invites_enabled   = false;
 		$this->contact_account   = [];
 
-		if (!empty($config->get('config', 'admin_email'))) {
-			$adminList = explode(',', str_replace(' ', '', $config->get('config', 'admin_email')));
-			$administrator = User::getByEmail($adminList[0], ['nickname']);
-			if (!empty($administrator)) {
-				$adminContact = $database->selectFirst('contact', ['id'], ['nick' => $administrator['nickname'], 'self' => true]);
-				$this->contact_account = DI::mstdnAccount()->createFromContactId($adminContact['id']);
-			}
+		$administrator = User::getFirstAdmin(['nickname']);
+		if ($administrator) {
+			$adminContact = $database->selectFirst('contact', ['uri-id'], ['nick' => $administrator['nickname'], 'self' => true]);
+			$this->contact_account = DI::mstdnAccount()->createFromUriId($adminContact['uri-id']);
 		}
 	}
 }
diff --git a/src/Protocol/ActivityPub/Transmitter.php b/src/Protocol/ActivityPub/Transmitter.php
index 95bb0f3121..ca9a605fc4 100644
--- a/src/Protocol/ActivityPub/Transmitter.php
+++ b/src/Protocol/ActivityPub/Transmitter.php
@@ -1710,7 +1710,7 @@ class Transmitter
 		}
 
 		$data['attachment'] = self::createAttachmentList($item);
-		$data['tag'] = self::createTagList($item, $data['quoteUrl'] ?? '');  
+		$data['tag'] = self::createTagList($item, $data['quoteUrl'] ?? '');
 
 		if (empty($data['location']) && (!empty($item['coord']) || !empty($item['location']))) {
 			$data['location'] = self::createLocation($item);
@@ -2073,13 +2073,14 @@ class Transmitter
 		}
 
 		if (empty($uid)) {
-			// Fetch the list of administrators
-			$admin_mail = explode(',', str_replace(' ', '', DI::config()->get('config', 'admin_email')));
-
 			// We need to use some user as a sender. It doesn't care who it will send. We will use an administrator account.
-			$condition = ['verified' => true, 'blocked' => false, 'account_removed' => false, 'account_expired' => false, 'email' => $admin_mail];
-			$first_user = DBA::selectFirst('user', ['uid'], $condition);
-			$uid = $first_user['uid'];
+			$admin = User::getFirstAdmin(['uid']);
+			if (!$admin) {
+				Logger::warning('No available admin user for transmission', ['target' => $target]);
+				return false;
+			}
+
+			$uid = $admin['uid'];
 		}
 
 		$condition = ['verb' => Activity::FOLLOW, 'uid' => 0, 'parent-uri' => $object,