Hi,
Best way to validate Emails are by sending a campaign, When you send a campaign it automatically removes hardbounces.
What will be the plan to validate and send 1 million mails with good inbox?
To clean Emails, we use 2 servers plan,
First server is of 4 ips 4 domain only (We will use it to send 50k test mails), will use it to run fast campaign that will clean entire list from Hardbounce, also we manually remove possible spamtraps too.
Second Server will be 8 domain 32 ips server, will be used to send regular campaigns with high probability of inbox.
For Test campaign of 50k, we will use 4 ips 4 domain, Each domain will send approx 12k mails Cost $100 as per your budget.
We can increase ips or domains if require depending on your lists, Like if you have more Office365 email ids, we need to have more ips.
lets discuss it more
Thanks
Gajendra Gupta
Email Server Hub