Postmark is a fast, reliable email delivery service designed for transactional emails. It ensures high deliverability, scalability, and real-time email tracking, providing developers with the tools to send critical notifications securely and efficiently.
If email deliverability is important, then Postmark is king. I've used all sorts of providers, with dedicated IPs and without. Postmark has always had the best deliverability and has resulted in the least amount of customer service time wasted dealing with users who simply did not receive an important email from us. It is pricier than other options, but it's well worth it if deliverability is at all important to you.
The only thing that confused me initially was that if you don't put a specific sender email into the Wordpress plugin settings (I use Postmark exclusively with Wordpress site), it won't send emails. I thought that having selected the option to send via any @domain.com email, I wouldn't need to fill out a specific email to send from, but that isn't the case. I sorted that out quickly with support.
Fortunately, the support is not often needed, but when it is, they are available and ready to dive into your needs and often your customer's needs. It's a bad day when you have to call your email delivery service provider, it means that your own customers most likely are calling your support team, and you're calling to see what the issue is. Postmark makes this process simple, and they own their mistakes. Always nice to see that.
In my opinion, sendgrid is complete garbage compared to Postmark, it's not even a comparison. I had issues with emails being sent to spam using sendgrid IPs. The dashboard is inferior, the setup is fairly comparable in difficulty, and ongoing visibility is inferior.
