Deliverability Best Practices

Deliverability determines whether your emails land in the inbox or the spam folder. It is directly controlled by your domain health, sending behavior, and content quality.

Mailbox warming

New sending domains must be warmed before running campaigns. Warming = sending small volumes of email (to real, engaged addresses) that increases gradually over 2–4 weeks. This builds a positive sending reputation with ISPs.

Enable automatic warming at Settings → Sending Domains → [Domain] → Enable Warming. The platform handles the schedule automatically.

Sending volume guidelines

• Week 1–2: 20–30 emails/day per mailbox
• Week 3–4: 50–75 emails/day per mailbox
• Week 5+: up to 100–150 emails/day per mailbox (with good deliverability scores)

Content practices for deliverability

• Plain text emails outperform HTML for cold outreach (fewer spam triggers)
• Avoid spam trigger words: FREE, GUARANTEE, NO OBLIGATION, CLICK HERE, LIMITED TIME
• Keep emails under 200 words for cold sequences
• One link maximum per cold email (links are a spam filter signal)
• Always include an unsubscribe mechanism

Monitoring deliverability

Settings → Sending Domains → [Domain] → Health. The platform shows your spam rate, bounce rate, and domain reputation score. If spam rate exceeds 0.3%, pause and investigate immediately.