Holiday Deliverability

Best Practices

Holiday season means higher email volume, more competition for inbox space, and lower tolerance from both recipients and mailbox providers. If you don't prepare, the most important sending period of the year can become the most damaging to your reputation.

Why Holiday Season Is Different

Everyone Sends More

During November–December, global email volume increases 30–50%. Mailbox providers handle this surge by:

Tightening spam filters (false positives are preferred over letting spam through)
Reducing tolerance for marginal senders
Throttling more aggressively during peak hours

Recipients Are Overwhelmed

The average consumer receives significantly more promotional email during the holidays. When inboxes overflow:

Unsubscribe rates increase
Spam complaints spike
Open rates drop as emails compete for attention

The Stakes Are Higher

For ecommerce and retail, holiday email drives a disproportionate share of annual revenue. A deliverability problem during Black Friday or the December giving season is far more costly than the same problem in March.

Preparation Checklist

Start preparing at least 6 weeks before your peak season:

Authentication

[ ] SPF, DKIM, and DMARC are all passing — check now
[ ] No blacklist issues on your domain or sending IPs
[ ] Google Postmaster Tools shows "High" reputation

List Quality

[ ] Remove subscribers who haven't engaged in 6+ months
[ ] Run your list through an email verification service
[ ] Remove hard bounces and repeated soft bounces
[ ] Re-engagement campaign completed for lapsing subscribers

Infrastructure

[ ] ESP can handle your projected volume
[ ] If using a dedicated IP, it's warmed up for holiday volume
[ ] One-click unsubscribe is properly configured

Pre-holiday deliverability check

Run a free check on your domain before the holiday rush. Catch authentication and blacklist issues now, not during your peak season.

During Peak Season

Manage Volume Increases

Don't double your sending frequency overnight:

Normal Frequency	Holiday Approach
Weekly	Increase to 2x/week gradually, 3x/week max during peak
Biweekly	Move to weekly, with a single extra send for major events
Monthly	Move to biweekly, with targeted sends for key dates

Prioritize Engaged Subscribers

For your most important sends (Black Friday, Cyber Monday, year-end):

Send to highly engaged subscribers first (opened/clicked in last 30 days)
Send to engaged subscribers next (opened/clicked in last 90 days)
Consider skipping subscribers who haven't engaged in 180+ days entirely

Monitor Daily

During peak sending:

Check Google Postmaster Tools daily for reputation changes and spam rate
Monitor bounce rates per campaign
Watch complaint rates per send
Track delivery speed (throttling increases during peak periods)

Have a Rollback Plan

If you see reputation dropping:

Immediately reduce sending to engaged-only segments
Pause non-essential campaigns
Investigate the cause (content, list segment, authentication issue)
Resume gradually once metrics stabilize

After the Holidays

January Cleanup

The post-holiday period is critical for list maintenance:

Remove addresses that bounced during holiday campaigns
Segment out subscribers who didn't engage during any holiday send
Process all pending unsubscribes
Review which holiday campaigns generated the most complaints

Reputation Recovery

If your reputation took a hit during the holidays:

Reduce volume to pre-holiday levels immediately
Send only to your most engaged segments for 2–4 weeks
Monitor Postmaster Tools for recovery signals
Don't try to "make up" for lost sends by increasing volume — this makes recovery slower

Lessons for Next Year

Document what worked and what didn't:

Which campaigns had the best/worst engagement?
Did any sends trigger unusual complaint rates?
Were there any deliverability issues during peak volume?
What would you change about your holiday email strategy?

Email Deliverability During Holiday Season: A Sender's Survival Guide