Emails going to spam

Diagnosing spam placement

Step 1: Check DNS authentication

Use a tool like mail-tester.com or mxtoolbox.com to verify your sending domain has:

• SPF record: Authorizes your SMTP server. Missing SPF is the #1 cause of spam.
• DKIM signature: Proves the email wasn't altered in transit. Check that your email provider signed outgoing messages.
• DMARC policy: Even p=none (monitoring only) signals maturity to spam filters.

Step 2: Check your sending volume

Sending 500 emails on day 1 from a new account will trigger spam filters. Follow the warmup schedule:

• Days 1-5: max 10 emails/day
• Days 6-14: max 30 emails/day
• Days 15-30: max 75 emails/day
• Day 30+: max 200 emails/day

Revnox enforces this in Settings > Email Accounts > Warmup.

Step 3: Review email content

Spam filters score your content. Common triggers:

• Subject lines in ALL CAPS
• Words like "free", "guaranteed", "act now", "limited time offer"
• Heavy HTML with images and multiple links
• Link shorteners (bit.ly, tinyurl.com)

Plain text emails with one (or zero) links perform best for cold outreach.

Step 4: Check your bounce rate

If your bounce rate exceeds 3%, spam filters assume you're not verifying addresses. Revnox SMTP-verifies all enriched emails, but if you're importing a list, run it through an email validator first.

Step 5: Review complaint rate

If recipients are clicking "Report spam" at a rate above 0.1%, switch to a different subdomain or sending domain immediately.