diff --git a/interface/web/mail/form/mail_get.tform.php b/interface/web/mail/form/mail_get.tform.php
index 402c5b9035d681d229b5a26d491100b39ec04f0a..d25167a36752b692751aaa5d603445782f3be742 100644
--- a/interface/web/mail/form/mail_get.tform.php
+++ b/interface/web/mail/form/mail_get.tform.php
@@ -80,6 +80,9 @@ $form["tabs"]['mailget'] = array (
 			'formtype'	=> 'TEXT',
 			'validators'	=> array ( 	0 => array (	'type'	=> 'NOTEMPTY',
 														'errmsg'=> 'source_server_error_isempty'),
+										1 => array (	'type'	=> 'REGEX',
+														'regex' => '/^[\w\.\-]{2,64}\.[a-zA-Z]{2,10}$/',
+														'errmsg'=> 'source_server_error_regex'),
 									),
 			'default'	=> '',
 			'value'		=> '',
diff --git a/interface/web/mail/lib/lang/en_mail_get.lng b/interface/web/mail/lib/lang/en_mail_get.lng
index 74d2dd81a96ae6724ed6956cb773bd4efd17dc7c..e2180e5eb21bd87011963615609f21262bba9993 100644
--- a/interface/web/mail/lib/lang/en_mail_get.lng
+++ b/interface/web/mail/lib/lang/en_mail_get.lng
@@ -12,4 +12,5 @@ $wb["source_server_error_isempty"] = 'Server is empty.';
 $wb["source_username_error_isempty"] = 'Username is empty.';
 $wb["source_password_error_isempty"] = 'Password is empty.';
 $wb["destination_error_isemail"] = 'No destination selected.';
+$wb["source_server_error_regex"] = 'Pop3/Imap Server is not a valid domain name.';
 ?>
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