diff --git a/modules/admin/tpl/config_notification.html b/modules/admin/tpl/config_notification.html
index 279d2e45a..aab69ecdd 100644
--- a/modules/admin/tpl/config_notification.html
+++ b/modules/admin/tpl/config_notification.html
@@ -26,7 +26,7 @@
 			<div class="x_controls">
 				<input type="text" name="mail_default_name" id="mail_default_name" value="{escape($member_config->webmaster_name) ?: $module_config->siteTitle}" />
 				<br />
-				<p class="x_help-block">{$lang->cmd_admin_default_from_name_help}</p>
+				<p class="x_help-block" style="margin-top:10px">{$lang->cmd_admin_default_from_name_help}</p>
 			</div>
 		</div>
 		
@@ -40,7 +40,7 @@
 					{$lang->cmd_admin_force_default_sender}
 				</label>
 				<br />
-				<p class="x_help-block">{$lang->cmd_admin_default_from_email_help}</p>
+				<p class="x_help-block" style="margin-top:10px">{$lang->cmd_admin_default_from_email_help}</p>
 			</div>
 		</div>
 	
@@ -49,7 +49,7 @@
 			<div class="x_controls">
 				<input type="text" name="mail_default_reply_to" id="mail_default_reply_to" value="{escape($advanced_mailer_config->reply_to ?: config('mail.default_reply_to'))}" />
 				<br />
-				<p class="x_help-block">{$lang->cmd_admin_default_reply_to_help}</p>
+				<p class="x_help-block" style="margin-top:10px">{$lang->cmd_admin_default_reply_to_help}</p>
 			</div>
 		</div>
 		
@@ -61,9 +61,12 @@
 						<option value="{$driver_name}" selected="selected"|cond="$mail_driver === $driver_name">{$driver_definition['name']}</option>
 					<!--@end-->
 				</select>
-				<p class="x_help-block hidden-by-default show-for-dummy">
+				<p class="x_help-block hidden-by-default show-for-dummy" style="margin-top:10px">
 					{$lang->msg_advanced_mailer_about_dummy}<br />{$lang->msg_advanced_mailer_about_dummy_exceptions}
 				</p>
+				<p class="x_help-block hidden-by-default show-for-mailfunction" style="margin-top:10px">
+					{$lang->msg_advanced_mailer_about_mailfunction}
+				</p>
 			</div>
 		</div>
 		
@@ -216,7 +219,7 @@
 					{$lang->cmd_admin_force_default_sender}
 				</label>
 				<br />
-				<p class="x_help-block">{$lang->cmd_admin_default_from_phone_help}</p>
+				<p class="x_help-block" style="margin-top:10px">{$lang->cmd_admin_default_from_phone_help}</p>
 			</div>
 		</div>
 		
@@ -228,7 +231,7 @@
 						<option value="{$driver_name}" selected="selected"|cond="$sms_driver === $driver_name">{$driver_definition['name']}</option>
 					<!--@end-->
 				</select>
-				<p class="x_help-block hidden-by-default show-for-dummy">
+				<p class="x_help-block hidden-by-default show-for-dummy" style="margin-top:10px">
 					{$lang->cmd_admin_sms_dummy_driver_help}
 				</p>
 			</div>
@@ -292,7 +295,6 @@
 					<label class="x_control-label" for="sms_{$driver_name}_sender_key">{$lang->cmd_advanced_mailer_sender_key}</label>
 					<div class="x_controls">
 						<input type="password" name="sms_{$driver_name}_sender_key" id="sms_{$driver_name}_sender_key" value="{$conf_value}" />
-						<br />
 						<p class="x_help-block">{$lang->cmd_admin_sms_sender_key_help}</p>
 					</div>
 				</div>
diff --git a/modules/advanced_mailer/lang/en.php b/modules/advanced_mailer/lang/en.php
index 168a52cd6..e0637d2f3 100644
--- a/modules/advanced_mailer/lang/en.php
+++ b/modules/advanced_mailer/lang/en.php
@@ -78,8 +78,9 @@ $lang->cmd_advanced_mailer_exception_group = 'Exception Group';
 $lang->cmd_advanced_mailer_use_exceptions = 'Exception domains';
 $lang->cmd_advanced_mailer_use_exceptions_yes = 'Test with exceptions as configured';
 $lang->cmd_advanced_mailer_use_exceptions_no = 'Ignore exceptions and only test the default sending method';
-$lang->msg_advanced_mailer_about_dummy = 'Dummy does not actually send any email. It only records them. Use this option for testing.';
-$lang->msg_advanced_mailer_about_dummy_exceptions = 'Caution: if you have set up exception domains, email will be sent to those domains.';
+$lang->msg_advanced_mailer_about_dummy = 'Dummy does not actually send any email, but logs them. Use this option for testing.';
+$lang->msg_advanced_mailer_about_dummy_exceptions = 'Caution: if you have set up exception domains, unwanted email may be sent using other methods.';
+$lang->msg_advanced_mailer_about_mailfunction = 'This method uses the mail() function that comes with PHP itself. It has very low deliverability.<br /><span style="color:red">This option may be deprecated in the future, so please use a different sending method if at all possible.</span>';
 $lang->msg_advanced_mailer_sending_method_is_invalid = 'Please select a valid sending method.';
 $lang->msg_advanced_mailer_sending_method_is_not_configured = 'The selected sending method (%s) has not been fully configured. Please return to General Settings and finish configuring it.';
 $lang->msg_advanced_mailer_smtp_host_is_invalid = 'Please enter a valid SMTP server name.';
diff --git a/modules/advanced_mailer/lang/ko.php b/modules/advanced_mailer/lang/ko.php
index db607462e..40487e37a 100644
--- a/modules/advanced_mailer/lang/ko.php
+++ b/modules/advanced_mailer/lang/ko.php
@@ -78,8 +78,9 @@ $lang->cmd_advanced_mailer_exception_group = '예외 그룹';
 $lang->cmd_advanced_mailer_use_exceptions = '예외 도메인 설정';
 $lang->cmd_advanced_mailer_use_exceptions_yes = '예외 설정을 적용하여 테스트';
 $lang->cmd_advanced_mailer_use_exceptions_no = '무시하고 기본 발송 방법만 테스트';
-$lang->msg_advanced_mailer_about_dummy = '더미는 실제로 메일을 발송하지 않고 기록만 하는 옵션입니다. 테스트에 사용하십시오.';
-$lang->msg_advanced_mailer_about_dummy_exceptions = '더미를 선택하더라도 예외 도메인을 지정한 경우 메일이 발송될 수 있으니 주의하십시오.';
+$lang->msg_advanced_mailer_about_dummy = '메일을 발송하지 않고 로그 기록만 하도록 강제합니다. 테스트 중 원치 않는 메일이 발송되는 것을 막기 위해 사용할 수 있습니다.';
+$lang->msg_advanced_mailer_about_dummy_exceptions = '이 옵션을 선택하더라도 예외 도메인을 지정한 경우 메일이 발송될 수 있으니 주의하십시오.';
+$lang->msg_advanced_mailer_about_mailfunction = 'PHP에 내장된 mail() 함수를 사용합니다. 발송 성공률이 매우 낮습니다.<br/><span style="color:red">이 옵션은 추후 지원되지 않을 수 있으니, 가능하면 다른 방식을 선택하시기 바랍니다.</span>';
 $lang->msg_advanced_mailer_sending_method_is_invalid = '올바른 발송 방법을 선택해 주십시오.';
 $lang->msg_advanced_mailer_sending_method_is_not_configured = '선택한 발송 방법(%s)이 완전히 설정되지 않았습니다. 기본 설정 페이지로 돌아가서 설정을 마쳐 주십시오.';
 $lang->msg_advanced_mailer_smtp_host_is_invalid = '올바른 SMTP 서버 이름을 입력해 주십시오.';