Skip Back-End Configuration
Most mail forms work by using a call to a mail function, which requires you to install & configure services and processes on the server that hosts the website. These services are difficult to configure, thus they're often are not configured correctly. This can can leave servers vulnerable to abuse.
Why services can be dangerous
When someone builds your website, they likely put it on a cheap shared hosting plan and then walk away. When systems aren't maintained diligently, they miss important security and version updates, leaving your system open to attack. Vulnerable systems are sought out, hijacked, and turned into spam factories. When a server is used to deliver spam, it may end up on a blacklist.
Sending email from your domain
If you pay for managed email service, there are ways to connect and send outgoing email through that service. There are several flaws in the way web servers authenticate and deliver mail on behalf of your domain, though, and email can silently fail to deliver or fail to be received if it is not set up properly. If you can receive email at your domain, we can securely and reliably deliver on your behalf without any additional configuration.
Ask a system administrator about postfix
No really, I wouldn't do that if I were you. Postfix is one of the core services that allows mail to be sent. Any sysadmin who has had to debug a broken postfix service won't want to touch it again, and they definitely don't want to talk about it.
Hook Forms work on any page, any platform
Whether your site is hosted as static HTML or through a CMS, Hook Forms can be added to any page, and because we handle the processing of form submissions on our end, you won't need to run, configure, or update any back-end services to deal with mail.