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How to calculate and adjust sending volume over time

Maintaining the right sending volume is essential for deliverability and reputation in Sendigram. Sending too many emails too fast can trigger spam filters, while sending too few may limit your campaign's impact. This guide explains how to estimate, track, and adjust your sending volume strategically.

1. Why Sending Volume Matters

  • Email providers (Gmail, Outlook, Yahoo) monitor the number of emails you send.
  • Sudden spikes in volume can raise red flags and hurt deliverability.
  • Consistent, steady sending builds a positive sender reputation.

2. Calculating Your Sending Volume

Formula: (Number of contacts) × (Number of campaigns per month) = Monthly sending volume

Example: 10,000 contacts × 4 campaigns/month = 40,000 emails/month.

Compare this with your subscription package limit in Sendigram.

3. Adjusting Volume Over Time

  • Start slow, then increase gradually:
    • Especially important when using a new domain or dedicated IP.
    • Begin with smaller batches (e.g., 1,000 emails/day) and ramp up week by week.
  • Scale based on engagement:
    • Focus on active subscribers first.
    • Expand gradually to include inactive or less engaged users.
  • Adapt to seasonality:
    • Increase sending before peak seasons (holidays, promotions).
    • Reduce during quieter periods to maintain healthy reputation.

4. Monitoring Performance While Scaling

  • Watch your bounce rate — keep it below 2%.
  • Track spam complaints — should remain under 0.1%.
  • Monitor open and click rates — drops may signal volume is too high or audience is oversaturated.
  • Use Sendigram Reports to evaluate performance per campaign.

5. Best Practices for Sustainable Sending

  • Segment your audience: Send more often to engaged subscribers.
  • Clean lists regularly: Remove invalid and inactive emails to improve ratios.
  • Warm up IPs: Dedicated IPs must be warmed up gradually before sending large volumes.
  • Use automation: Spread volume over time with triggered emails instead of big one-off blasts.

6. Troubleshooting Over-Sending Issues

  • If open rates drop suddenly: reduce volume and focus on your most active segments.
  • If emails land in spam: review your authentication (SPF, DKIM, DMARC) and sending patterns.
  • If you hit Sendigram's monthly quota, consider:
    • Upgrading your plan.
    • Purchasing one-time email packages.
    • Adjusting campaign frequency.
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