best config to mass mail

Need help

I have already a dedicated server with interspire.

on mail-tester.com I got 10/10

last week I try to send in 24 hours 4000 email with interspire.
I got 900 bounce email and 3100 delevery.

After this campain I test to send mail on my mailbox and everytime I receive the mail in my spam folder.

someone can help me ?

Mass mailing solution up to 0.5 million per day and more...

Multiple MTA (Mass Transfer Agent)
From e-mails Rotation
Ip rotation
DKIM Setting
SPF Settings
Monitoring
and more...

skype :- mendosa.john159