Email headers decreasing INBOX placement

on Google workspace SMTP setup, I notice a lot of headers where I want to ask if they are necessary, I have tested multiple software vendors (GHL) and the data shows INBOX placement for EMR templates are decreasing, even on TEXT ONLY MESSAGES.

Additionally, inquiring as to if these are really necessary? ESP

Didn’t want to bother you on the chat, since it’s not “critical” in the sense, but since it’s part of the CORE mechanism for delivery for clients, I would argue this is one of the most important things to get right.

According to GOOGLE AI (added context)

these three headers often act as a signal for the Promotions tab, not the Primary inbox. If your goal is the Primary tab, these headers are a bit of a "double-edged sword."

Here is how they impact your placement:

1. Precedence: list (The "Bulk" Signal)

• Effect: This header explicitly tells Gmail, "This is an automated mailing list message."

• Placement: It almost guarantees your email will be filtered out of the Primary tab and into Promotions or Updates. Gmail reserves the Primary tab for one-to-one, human-style conversations.

2. List-Unsubscribe & List-Unsubscribe-Post

• Effect: These are technical markers of a "Bulk Sender".

• Placement: Like Precedence: list, these signal to Gmail that the message is a newsletter or marketing blast, which naturally pushes it toward the Promotions tab.

• The Reputation Benefit: While they might keep you out of Primary, they are crucial for staying out of Spam. By making it easy to opt out, you prevent users from hitting the "Report Spam" button. A high spam complaint rate (above 0.3%) will sink your reputation and land you in the Spam folder.