If you're still sending email with default SMTP, you're blind to delivery problems! This Postmark Approved WordPress Plugin enables WordPres
Easily integrate transactional email into WordPress' default emails.
Replaces wp_mail to send email via the Postmark API. Supports Reply-To for simple integration with contact form plugins.
A simple plugin that replaces the default wp_mail function with PostMarkApp (http://postmarkapp.com/).