The fundamentals
SPF (Sender Policy Framework)
Add a DNS TXT record authorizing your email server to send on behalf of your domain:
v=spf1 include:_spf.google.com ~all
DKIM (DomainKeys Identified Mail)
Add the DKIM public key to DNS so recipients can verify your emails weren't tampered with.
DMARC
Set a DMARC policy to tell recipients what to do with emails that fail SPF/DKIM:
v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com
Email warmup
New email accounts start with zero reputation. Sending 500 emails on day 1 will destroy your deliverability.
Revnox warmup schedule:
- Day 1-5: 5 emails/day
- Day 6-15: 15 emails/day
- Day 16-25: 30 emails/day
- Day 26+: Full limit
Avoiding spam filters
Don't use link-heavy emails
Avoid ALL CAPS in subject lines
Don't use spam trigger words ("free", "guarantee", "limited time")
Keep text-to-HTML ratio high (plain text is better)
Add random delays between sends (Revnox does this automatically)
Don't send to unverified emails (high bounce rate = spam flag)Monitoring
Watch these metrics:
- Bounce rate < 3%
- Spam complaint rate < 0.1%
- Open rate > 40% (indicates inbox placement)