SPAM - Email Mass Sending Dos and Dont's

Hello.

Im going to start pushing 20k emails a day to scraped emails sending them to a landing page.

I think I should use a URL redirect as the landing page is connected to my mother site.

But is there anything else I should be doing or not doing?

Im sending a simple join my list form *if thats important.

**If you know any safer ways to send out an email capture to a cold list. Lmk

Thanks

PS: Will this cause my mother page to be affected in any way?

Following. This seems important to me

Don't use words like offers, free, giveaway, discount etc. in your subject or mail. Some of these words trigger spam filters.