If you are just doing cold mailing on one-to-one basis, you can use migadu.com for it. Everyone has to do that at some point and it is not spam. 500 mails is no

If you are just doing cold mailing on one-to-one basis, you can use migadu.com for it. Everyone has to do that at some point and it is not spam. 500 mails is not a lot. Just cap it daily to e.g. 50-100 or you could hurt your own domain reputation. > Email spam, also known as junk email, refers to unsolicited email messages, usually sent in bulk to a large list of recipients.