diff --git a/actions/admin/settings/131.ssl.php b/actions/admin/settings/131.ssl.php
index 20a9f409..a77ec589 100644
--- a/actions/admin/settings/131.ssl.php
+++ b/actions/admin/settings/131.ssl.php
@@ -248,7 +248,7 @@ return [
 					'settinggroup' => 'system',
 					'varname' => 'le_domain_dnscheck_resolver',
 					'type' => 'text',
-					'string_regexp' => '/^(([a-z0-9\-\._]+, ?)*[a-z0-9\-\._]+)?$/i',
+					'string_type' => 'validate_ip',
 					'string_emptyallowed' => true,
 					'default' => '',
 					'save_method' => 'storeSettingField'
diff --git a/install/froxlor.sql.php b/install/froxlor.sql.php
index 2ed6b534..0b4d0218 100644
--- a/install/froxlor.sql.php
+++ b/install/froxlor.sql.php
@@ -686,7 +686,7 @@ opcache.validate_timestamps'),
 	('api', 'customer_default', '1'),
 	('2fa', 'enabled', '1'),
 	('panel', 'decimal_places', '4'),
-	('panel', 'adminmail', 'admin@SERVERNAME'),
+	('panel', 'adminmail', 'ADMIN_MAIL'),
 	('panel', 'phpmyadmin_url', ''),
 	('panel', 'webmail_url', ''),
 	('panel', 'webftp_url', ''),
diff --git a/lib/Froxlor/Cli/ConfigServices.php b/lib/Froxlor/Cli/ConfigServices.php
index 1833e0e2..2f280926 100644
--- a/lib/Froxlor/Cli/ConfigServices.php
+++ b/lib/Froxlor/Cli/ConfigServices.php
@@ -514,6 +514,7 @@ final class ConfigServices extends CliCommand
 			'<WEBSERVER_GROUP>' => Settings::Get('system.httpgroup'),
 			'<SSL_CERT_FILE>' => Settings::Get('system.ssl_cert_file'),
 			'<SSL_KEY_FILE>' => Settings::Get('system.ssl_key_file'),
+			'<ADMIN_MAIL>' => Settings::Get('panel.adminmail'),
 		];
 	}
 }
diff --git a/lib/Froxlor/Config/ConfigDisplay.php b/lib/Froxlor/Config/ConfigDisplay.php
index cfaceb46..6cc76a65 100644
--- a/lib/Froxlor/Config/ConfigDisplay.php
+++ b/lib/Froxlor/Config/ConfigDisplay.php
@@ -117,7 +117,7 @@ class ConfigDisplay
 			'<SQL_UNPRIVILEGED_PASSWORD>' => 'FROXLOR_MYSQL_PASSWORD',
 			'<SQL_DB>' => $sql['db'],
 			'<SQL_HOST>' => $sql['host'],
-			'<SQL_SOCKET>' => isset($sql['socket']) ? $sql['socket'] : null,
+			'<SQL_SOCKET>' => $sql['socket'] ?? null,
 			'<SERVERNAME>' => Settings::Get('system.hostname'),
 			'<SERVERIP>' => Settings::Get('system.ipaddress'),
 			'<NAMESERVERS>' => Settings::Get('system.nameservers'),
@@ -127,12 +127,15 @@ class ConfigDisplay
 			'<VIRTUAL_GID_MAPS>' => Settings::Get('system.vmail_gid'),
 			'<SSLPROTOCOLS>' => (Settings::Get('system.use_ssl') == '1') ? 'imaps pop3s' : '',
 			'<CUSTOMER_TMP>' => FileDir::makeCorrectDir($customer_tmpdir),
-			'<BASE_PATH>' => FileDir::makeCorrectDir(Froxlor::getInstallDir()),
+			'<BASE_PATH>' => Froxlor::getInstallDir(),
 			'<BIND_CONFIG_PATH>' => FileDir::makeCorrectDir(Settings::Get('system.bindconf_directory')),
 			'<WEBSERVER_RELOAD_CMD>' => Settings::Get('system.apachereload_command'),
 			'<CUSTOMER_LOGS>' => FileDir::makeCorrectDir(Settings::Get('system.logfiles_directory')),
 			'<FPM_IPCDIR>' => FileDir::makeCorrectDir(Settings::Get('phpfpm.fastcgi_ipcdir')),
-			'<WEBSERVER_GROUP>' => Settings::Get('system.httpgroup')
+			'<WEBSERVER_GROUP>' => Settings::Get('system.httpgroup'),
+			'<SSL_CERT_FILE>' => Settings::Get('system.ssl_cert_file'),
+			'<SSL_KEY_FILE>' => Settings::Get('system.ssl_key_file'),
+			'<ADMIN_MAIL>' => Settings::Get('panel.adminmail'),
 		];
 
 		$commands_pre = "";
diff --git a/lib/Froxlor/Install/Install.php b/lib/Froxlor/Install/Install.php
index 70bc443c..d0a4dcb6 100644
--- a/lib/Froxlor/Install/Install.php
+++ b/lib/Froxlor/Install/Install.php
@@ -99,7 +99,7 @@ class Install
 			}
 
 			// check for url manipulation or wrong step
-			if ((isset($_SESSION['installation']['stepCompleted']) && ($this->currentStep + 1) > $_SESSION['installation']['stepCompleted'])
+			if ((isset($_SESSION['installation']['stepCompleted']) && $this->currentStep > $_SESSION['installation']['stepCompleted'])
 				|| (!isset($_SESSION['installation']['stepCompleted']) && $this->currentStep > 0)
 			) {
 				$this->currentStep = isset($_SESSION['installation']['stepCompleted']) ? $_SESSION['installation']['stepCompleted'] + 1 : 1;
@@ -322,6 +322,8 @@ class Install
 		$email = $validatedData['admin_email'] ?? '';
 		$password = $validatedData['admin_pass'] ?? '';
 		$password_confirm = $validatedData['admin_pass_confirm'] ?? '';
+		$useadminmailassender = $validatedData['use_admin_email_as_sender'] ?? '1';
+		$senderemail = $validatedData['sender_email'] ?? '';
 
 		if (!preg_match('/^[^\r\n\t\f\0]*$/D', $name)) {
 			throw new Exception(lng('error.stringformaterror', ['admin_name']));
@@ -329,6 +331,8 @@ class Install
 			throw new Exception(lng('error.loginnameiswrong', [$loginname]));
 		} elseif (empty(trim($email)) || !Validate::validateEmail($email)) {
 			throw new Exception(lng('error.emailiswrong', [$email]));
+		} elseif ((int)$useadminmailassender == 0 && !empty(trim($senderemail)) && !Validate::validateEmail($senderemail)) {
+			throw new Exception(lng('error.emailiswrong', [$senderemail]));
 		} elseif (empty($password) || $password != $password_confirm) {
 			throw new Exception(lng('error.newpasswordconfirmerror'));
 		} elseif ($password == $loginname) {
diff --git a/lib/Froxlor/Install/Install/Core.php b/lib/Froxlor/Install/Install/Core.php
index ca21780e..ef66156e 100644
--- a/lib/Froxlor/Install/Install/Core.php
+++ b/lib/Froxlor/Install/Install/Core.php
@@ -365,7 +365,14 @@ class Core
 
 		$mainip = !empty($this->validatedData['serveripv6']) ? $this->validatedData['serveripv6'] : $this->validatedData['serveripv4'];
 
-		$this->updateSetting($upd_stmt, 'admin@' . $this->validatedData['servername'], 'panel', 'adminmail');
+		if ($this->validatedData['use_admin_email_as_sender'] == '1') {
+			$adminmail_value = $this->validatedData['admin_email'];
+		} elseif ($this->validatedData['use_admin_email_as_sender'] == '0' && !empty($this->validatedData['sender_email'])) {
+			$adminmail_value = $this->validatedData['sender_email'];
+		} else {
+			$adminmail_value = 'admin@' . $this->validatedData['servername'];
+		}
+		$this->updateSetting($upd_stmt, $adminmail_value, 'panel', 'adminmail');
 		$this->updateSetting($upd_stmt, $mainip, 'system', 'ipaddress');
 		if ($this->validatedData['use_ssl']) {
 			$this->updateSetting($upd_stmt, 1, 'system', 'use_ssl');
@@ -563,7 +570,7 @@ class Core
 			'password' => password_hash($this->validatedData['admin_pass'], PASSWORD_DEFAULT),
 			'adminname' => $this->validatedData['admin_name'],
 			'email' => $this->validatedData['admin_email'],
-			'deflang' => 'en' // TODO: set lanuage
+			'deflang' => 'en' // TODO: set language
 		];
 		$ins_stmt = $db_user->prepare("
 			INSERT INTO `" . TABLE_PANEL_ADMINS . "` SET
diff --git a/lib/configfiles/bookworm.xml b/lib/configfiles/bookworm.xml
index 0eb13095..70b0cd3f 100644
--- a/lib/configfiles/bookworm.xml
+++ b/lib/configfiles/bookworm.xml
@@ -1556,7 +1556,7 @@ noc: root
 security: root
 
 # change this to a valid e-mail address you can access
-root:               root@<SERVERNAME>
+root:               <ADMIN_MAIL>
 ]]>
 							</content>
 						</file>
diff --git a/lib/configfiles/bullseye.xml b/lib/configfiles/bullseye.xml
index f44cc880..366689e0 100644
--- a/lib/configfiles/bullseye.xml
+++ b/lib/configfiles/bullseye.xml
@@ -1556,7 +1556,7 @@ noc: root
 security: root
 
 # change this to a valid e-mail address you can access
-root:               root@<SERVERNAME>
+root:               <ADMIN_MAIL>
 ]]>
 							</content>
 						</file>
diff --git a/lib/configfiles/focal.xml b/lib/configfiles/focal.xml
index deb305d9..67af7ed4 100644
--- a/lib/configfiles/focal.xml
+++ b/lib/configfiles/focal.xml
@@ -1585,7 +1585,7 @@ noc: root
 security: root
 
 # change this to a valid e-mail address you can access
-root:               root@<SERVERNAME>
+root:               <ADMIN_MAIL>
 ]]>
 							</content>
 						</file>
diff --git a/lib/configfiles/gentoo.xml b/lib/configfiles/gentoo.xml
index 9fb993e8..01d33fa9 100644
--- a/lib/configfiles/gentoo.xml
+++ b/lib/configfiles/gentoo.xml
@@ -1541,7 +1541,7 @@ noc: root
 security: root
 
 # change this to a valid e-mail address you can access
-root:               root@<SERVERNAME>
+root:               <ADMIN_MAIL>
 ]]>
 							</content>
 						</file>
diff --git a/lib/configfiles/jammy.xml b/lib/configfiles/jammy.xml
index 475958f9..67450c27 100644
--- a/lib/configfiles/jammy.xml
+++ b/lib/configfiles/jammy.xml
@@ -1585,7 +1585,7 @@ noc: root
 security: root
 
 # change this to a valid e-mail address you can access
-root:               root@<SERVERNAME>
+root:               <ADMIN_MAIL>
 ]]>
 							</content>
 						</file>
diff --git a/lib/formfields/install/formfield.install.php b/lib/formfields/install/formfield.install.php
index 2dbe0a1f..222832c8 100644
--- a/lib/formfields/install/formfield.install.php
+++ b/lib/formfields/install/formfield.install.php
@@ -143,6 +143,18 @@ return [
 						'mandatory' => true,
 						'value' => old('admin_email', null, 'installation'),
 					],
+					'use_admin_email_as_sender' => [
+						'label' => lng('install.admin.use_admin_email_as_sender'),
+						'type' => 'checkbox',
+						'value' => '1',
+						'checked' => old('use_admin_email_as_sender', '1', 'installation'),
+					],
+					'sender_email' => [
+						'label' => lng('serversettings.adminmail.title'),
+						'placeholder' => lng('install.admin.use_autogenerated_email_as_sender'),
+						'type' => 'email',
+						'value' => old('sender_email', null, 'installation'),
+					],
 				]
 			],
 			'step3' => [
diff --git a/lng/de.lng.php b/lng/de.lng.php
index 89991bb9..86f3438e 100644
--- a/lng/de.lng.php
+++ b/lng/de.lng.php
@@ -2253,6 +2253,8 @@ Vielen Dank, Ihr Administrator',
 			'top' => 'Admin Konto',
 			'title' => 'Erstellen des Haupt-Administrators.',
 			'description' => 'Dieser Benutzer erhält alle Berechtigungen zur Anpassungen von Einstellungen und Erstellen/Bearbeiten/Löschen von Resourcen wie Kunden, Domains, etc.',
+			'use_admin_email_as_sender' => 'Verwende die oben angegebene E-Mail-Adresse als Absenderadresse. Wenn die Option deaktiviert ist, geben Sie unten bitte eine Absenderadresse an.',
+			'use_autogenerated_email_as_sender' => 'Leer lassen für Standard: admin@servername',
 		],
 		'system' => [
 			'top' => 'System Setup',
diff --git a/lng/en.lng.php b/lng/en.lng.php
index 2b3294f7..d511538a 100644
--- a/lng/en.lng.php
+++ b/lng/en.lng.php
@@ -2389,6 +2389,8 @@ Yours sincerely, your administrator',
 			'top' => 'Admin user',
 			'title' => 'Let\'s create the main administrator user.',
 			'description' => 'This user will be granted all privileges to adjust settings and add/update/delete resources like customers, domains, etc.',
+			'use_admin_email_as_sender' => 'Use the email address above as sender address. If unchecked, please specify a sender address below.',
+			'use_autogenerated_email_as_sender' => 'Leave empty for default: admin@servername',
 		],
 		'system' => [
 			'top' => 'System setup',
diff --git a/templates/Froxlor/assets/scss/components/_form.scss b/templates/Froxlor/assets/scss/components/_form.scss
index bcaa6c60..4e3a7572 100644
--- a/templates/Froxlor/assets/scss/components/_form.scss
+++ b/templates/Froxlor/assets/scss/components/_form.scss
@@ -6,6 +6,14 @@
 	background-color: $body-tertiary-bg;
 }
 
+.form-floating > .form-control::placeholder {
+	color: revert;
+}
+
+.form-floating > .form-control:not(:focus)::placeholder {
+	color: transparent;
+}
+
 @include color-mode(dark) {
 	.formfield {
 		border-bottom: $border-color-dark solid 1px;