Based on our record, Mailhardener seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You don't. I'd run your domain through the configurations at mailhardener.com and build a shrine to the SMTP Gods. Source: about 2 years ago
DMARC Report - DMARC Report allows service providers and businesses to monitor and manage a large number of domains for DMARC compliance.
Mailgun - A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
PowerDMARC - Stop hackers to send emails from your domain
JangoSMTP - JangoSMTP is a transactional email delivery service that adds tracking and authentication to email.
EasyDMARC - Cloud Native DMARC
PHPMailer - Email sending library for PHP.