Hi,

Speaking of my experience, I get emails from different landing pages

Before (weeks ago), I didn't add any email verification to check the email that the user let in the form, so my mailing list wasn't so clean.

So when I sent emails, I had many bounces.

Now, I have integrated some API to check the email of the users in real-time (I used briteverify api, but a bit expensive, I'm now using algocheck.com API), and I reduce by almost 20% bad emails (bad type, disposable emails...). I have now almost no bounces, and my smtp sender reputation is increasing.

Anyway, I really recommend using those tools!

Ryan