How to successfully send email from Digital Ocean that doesn't land in spam or get rejected?

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The original was posted on /r/selfhosted by /u/uploto on 2023-08-04 16:46:51.

I have a project on DO, and I would like to know what's the best email client and solutions so that outgoing mail does not end in spam and there's deliverability to Gmail accounts.

I will respond to customer inquiries, but I also need to contact targeted businesses approximately 15 times per day for the first 14 days. Response rates are typically high due to what's being offered.

I was previously on Hetzner, however, my account was accessed and someone attempted to purchase servers from within my account. So I made the switch to Digital Ocean. A lot of potential customers were responding to my emails apologizing for the delay in their response as they couldn't see my email since it was delivered to their spam folder. There's other potential customers who have given me their email address and asked me to contact them and also had trouble viewing since it was delivered to spam.