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I think it all comes down when you act as a legitimate sender in every way. here's how you can look like one: Let's start with domain: • Used aged domains (30 days at least) • Define different domains for different functions to avoid cross contamination. maybe different subdomain for different use case. For example. mail.company.com for outbound, promo.company.com for offers and marketing, etc. • Warm them all up - manually or with a tool. Non negotiable. Authentication of DNS is not optional. Please make sure you have: 1. SPF 2. DKIM 3. DMARC all the 3 records set correctly for every domain. Now for Infra: 1. Don't abuse or look like you are abusing - I mean scale slowly and not rapidly. If you are doing 100 emails a day for last 2 months, don't suddenly do 500 a day. 2. No sudden upticks on sending. For email copy: 1. Direct links only 2. Avoid spam keywords for sure 3. Don't link to Google Drive or Dropbox or similar doc sharing tools 4. Legitimate email signatures - builds authority Generic tips: 1. Space out your emails 2. Clean your list every week or a set time frame according to your sending quantity and frequency. 3. maintain and optimize list for different use cases - more list, the better, less emails per blast - more context 4. Always have backup domains warmed up and ready 5. If using sendgrid - rotate IP address whenever you see an uptick in spam landings 6. Unsubscribe link is a must 7. If using partners and other third party sources and providing them your domain email - always audit

Apart from the fundamentals of DKIM, SPF, and tech, use Instantly for warmups. Should work. If you're doing mass emails at scale make sure to change your IP each month, Sendgrid gives you that option.