Email Warmup Guide
Email warmup builds sender reputation before you launch cold outreach campaigns. A new or dormant email address sending dozens of cold emails will almost certainly be marked as spam. Warmup gradually establishes trust with email providers by ramping sending volume over 5 weeks, mimicking natural account activity. This guide explains why warmup matters, how it works in Swokei, and how to manage it for maximum campaign success.
Why email warmup is critical
Every email address has a reputation score with Gmail, Outlook, and other inbox providers. When they see an address for the first time sending bulk email to strangers, their spam filters assume the worst—because most addresses behaving that way genuinely are spam.
Warmup solves this by starting small (3 emails per day) and slowly increasing volume over 5 weeks. This gradual ramp mimics how a real person's email activity grows, which is the signal providers want to see before granting trust. Skip warmup and you risk permanent reputation damage that takes weeks—or never—to recover.
How Swokei's warmup schedule works
Swokei uses a 5-week warmup ramp. Your daily sending limit increases automatically based on which day you're on:
| Days | Max warmup emails/day | Status label in Swokei |
|---|---|---|
| Days 1–7 | 3 | Just started |
| Days 8–14 | 7 | In progress |
| Days 15–21 | 15 | Good progress |
| Days 22–28 | 25 | Near full capacity |
| Days 29+ | 50 | Fully warmed |
These limits apply only to warmup emails. Campaign emails use a separate sending queue and don't count against the warmup cap.
Enabling warmup on a mailbox
- In the Swokei sidebar, click "Mailboxes".
- Click on the mailbox you want to warm up. A settings drawer slides in from the right.
- Click the "Warmup" tab (next to the "General" tab).
- Click the "Enable warmup" button.
- A confirmation appears at the bottom. The Warmup tab now displays your warmup status including:
- Current day: your progress through the warmup schedule (starts at 0, increments daily)
- Daily sent: how many warmup emails went out today
- Total sent: cumulative warmup emails from this mailbox
- Status badge: a color-coded label showing your warmup phase
- Full warmup schedule: a visual timeline of each phase and its daily sending limits
Understanding your warmup status
Each warmup phase has a status badge showing your progress at a glance:
- Just started (orange) — Days 1–7. Too early for campaigns; focus only on warmup.
- In progress (amber) — Days 8–14. Small test campaigns only (5–10 leads per day maximum).
- Good progress (green) — Days 15–21. Moderate campaigns are safe; gradually increase volume.
- Near full capacity (green) — Days 22–28. Ramp campaigns up more aggressively if needed.
- Fully warmed (bright green) — Day 29+. Safe for full campaign volume up to your mailbox's daily sending limit.
- Paused (yellow) — Warmup is manually paused. No warmup emails are being sent.
When to start campaigns
You can technically run campaigns from Day 14 onwards, but timing matters. The safest approach is to follow this schedule:
- Days 1–13: Warmup only. No campaigns.
- Days 14–20: Small test campaigns of 5–10 leads per day maximum.
- Days 21–28: Increase to 20–30 campaign emails per day.
- Day 29+: Full campaign volume (up to your mailbox's daily sending limit).
This gradual ramp ensures campaign emails are sent from an address with established reputation, dramatically improving your inbox placement rate from day one of serious outreach.
How warmup emails work
Warmup emails are real messages sent between Swokei's network of trusted addresses and established partner addresses. They're conversational in tone and follow all email best practices—they get sent, received, opened, and sometimes marked "not spam" by recipients. These positive engagement signals tell inbox providers that your address sends legitimate mail people want to read.
You won't see warmup emails in your inbox because they're processed at the server level. Swokei generates them automatically based on the warmup schedule—you don't write or manage them.
Pausing and resuming warmup
To pause warmup (e.g., during a vacation), open your mailbox in the Mailboxes list, go to the Warmup tab, and click "Pause warmup". Your day counter is preserved, so when you resume, it picks up where you left off.
Click "Resume warmup" to restart, or "Disable warmup" to stop entirely. A pause of a few days is fine, but pausing for multiple weeks erodes some of the trust you've built. Try to keep warmup consistent if possible.
Warmup for multiple mailboxes
Warmup is configured individually for each mailbox. When you connect a second mailbox, you need to enable warmup separately for it—warmup progress on one mailbox doesn't transfer to another. Each mailbox maintains its own day counter, daily sent count, and status badge.
Can I run campaigns while warming up?
Yes. Warmup and campaign emails use separate sending queues, so they don't technically interfere. However, sending high campaign volumes from a mailbox that's only on warmup day 5 will likely damage the reputation you're building. Stick to low campaign volume (5–10 leads per day) until at least Day 14, and keep volume modest until Day 29.
What if I already have an established email address?
Warmup still helps. If you have an email that was regularly used but hasn't sent cold outreach before, running warmup for 2–3 weeks first establishes positive engagement signals before you start sending to strangers. This is especially true for addresses that have been dormant for months.