Make sure SPF, DKIM, and From domains are all at the same root/parent domain. AKA "alignment" in DMARC - this can help even without a full DMARC record. Tighte

Make sure SPF, DKIM, and From domains are all at the same root/parent domain. AKA "alignment" in DMARC - this can help even without a full DMARC record. Tighten your engagement segmentation for Gmail. Repeat every 2 weeks if you don't see improvement. If you get down to 30 day actives with no improvement, the problem is almost certainly elsewhere. Occasionally it can be related to external factors - 3rd party email traffic which might use your domain, say if you buy advertising in other newsletters, bad SEO practices (think 'blackhat' rather than 'mediocre'), or poor customer experience with your business/website. Hard bounce rates on your initial email are always a little elevated vs known recipients, but if you're above 2-3% that's too high and you should work to fix problems with the signup process.