I'm currently using Sendgrid for my Emails

But i see that we can use IPS email system

what exactly is the difference?

and would it be better for me to use IPS email system?

I ask this, because it seems like a lot of my emails keep getting sent to spam folders to members, not all, but a lot of them are saying that they don't get the email, or miss it, due to it being in spam folder?

Does IPS email system have better chances of not going to spam folder?

@FGN

I am using sendgrid and I don't seem to have this problem, I had it before when using ips with postfix or sendmail but switching to Sendgrid got me better deliverability.