Cold email / spamming infrastructure for legitimate businesses

Hello,
There is a domain called example-domain.com in EU which is a legitimate business, I want to send cold email that sells a product from this company (perhaps by including a pdf brochure or image) to a list of approximately 100 accounts on different domains. What is the best way to approach this without getting example-domain.com (normal domain, I don't need to include a link) marked as spam and also be able to communicate with them back and forth if they decide to respond?

I was thinking of paying for
https://www.blackhatworld.com/seo/which-is-best-email-spamming-blasting-software.1636103/post-18162704

The best email spamming/blasting tools are MailChimp, SendinBlue, and GetResponse, known for mass email campaigns with high deliverability. However, ensure compliance with anti-spam laws like CAN-SPAM to avoid legal issues.

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If you're sending to only 100 email addresses, you should not have a problem sending it manually from your company email. If you're sending on a b2b system then even better. Alternatively if you're sure about your email accounts source, then sendgrid is great as well.