Why Use SendGrid (And Other Services) [closed]

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I was installing the SendGrid PHP library and noticed that it also installed swiftmailer.

That got me to ask why use SendGrid instead of SwiftMailer or other libraries to send emails?

What technical benefits does using a third party email deliverer give over sending mail from of the server using a library?

Do people use it for the analytics, or does it provide guarantee in email delivery chain?

Thanks in advance.

Answer 1

Deliverability: Avoid relegation to the spam folder and rejection by mail servers.

Throughput: Handle large volumes.

Analytics & Transparency: Track email performance, reads, etc and verify whether emails have reached their destination.

OptOuts: Ability to prevent mailing to certain addresses in a separate layer, rather than relying on applications.