Email deliverability is no secret. Just send an email to one of many email deliverability testers to find out the spammyness of your email: https://www.mail-tester.com
The sender IP address is a large component in determining email spammyness. This is why SES allows you to pay extra for a dedicated IP address (https://docs.aws.amazon.com/ses/latest/dg/dedicated-ip.html). However, it's not something you will likely need unless you send in large volumes.
It's definitely no secret but those testers do not provide the full story. No do IP blocklist checkers - not all blocklists are created equal, nor do most have any impact at all.
For most senders, whilst IP reputation does play a role, as long as you're on a decent platform the majority of your deliverability concerns will be surrounding your own domain's reputation. Your domain reputation is directly influenced by your sending behaviour. You need to be sending to people who want to receive your email and will engage with it.
For most senders, whilst IP reputation does play a role, as long as you're on a decent platform the majority of your deliverability concerns will be surrounding your own domain's reputation. Your domain reputation is directly influenced by your sending behaviour. You need to be sending to people who want to receive your email and will engage with it.
iamacyborg's response above is spot on.