If you are facing problems like these, you should do the following:
First check if PHP-scripts can send emails
php -a mail ('firstname.lastname@example.org', "Test Postfix", "Test mail from postfix"); exit ();
Note: if after running
php -a, you get
"Interactive mode enabled" message but no
php> prompt, then your PHP is not compiled with readline support. If its working nice, you will get only
"Interactive mode" message with
You can still run test though. Just create a
testmail.php with following lines of codes:
<?php mail ('email@example.com', "Test Postfix", "Test mail from postfix"); ?>
and run it on your server with
php -f testmail.php command. If you can’t see any email form PHP, then that means its PHP’s fault.
Check value of
sendmail_path in php.ini config. If its wrong, fix it and run above test again.
Check if WordPress can send emails
Testing WordPress is easy. You can do it using this plugin. I know that plugin is not updated from 2 years but I tested it with WordPress 3.4 without any issue. Its a simple plugin so chances are very less that it will break in future as well! 😉
Now if in your test you can send emails but still facing issues with contact form, its better to check your plugins then. Mostly likely it will be some coding issue.