Why not just use Sendgrid or similar for SMTP emails to customers, get a dedicated IP with them and have way less concern. I always prefer to isolate those thi

Why not just use Sendgrid or similar for SMTP emails to customers, get a dedicated IP with them and have way less concern. I always prefer to isolate those things from the main corporate email and reputation anyway. You don't want your main domain getting hacked and affecting customer emails or vice versa.