Deliverability guide
Getting your emails into the inbox takes more than a valid address. This guide covers warmup, sending limits, authentication, and the habits that protect your sender reputation long-term.
@yourcompany.konvox.io subdomain. The domain is fully authenticated (SPF, DKIM, DMARC) and sent through Mailgun's EU infrastructure. You don't need to configure DNS records yourself.How warmup works
A new email address has no sending history. Internet service providers don't trust it yet, so blasting 200 emails on day one will almost certainly land in spam. Warmup solves this by ramping up volume gradually over 14 days, building a track record before you hit full speed.
Konvox tracks a warmup day counter for each sender. The effective daily limit follows this schedule:
| Day | Formula | Max sends |
|---|---|---|
| 1 | (0 + 1) x 5 | 5 |
| 2 | (1 + 1) x 5 | 10 |
| 3 | (2 + 1) x 5 | 15 |
| 5 | (4 + 1) x 5 | 25 |
| 7 | (6 + 1) x 5 | 35 |
| 10 | (9 + 1) x 5 | 50 |
| 14+ | Full daily limit | Your configured cap |
Once day 14 passes, the sender runs at your configured daily limit. The default is 50 emails per day per sender. You can raise this in Settings > Sender emails, though going above 200/day on a single address needs careful list hygiene.
Daily sending limits by plan
| Plan | Sender addresses | Default cap per sender |
|---|---|---|
| Start | 1 | 50/day |
| Growth | 10 | 50/day |
| Scale | 50 | 50/day (configurable) |
You can adjust the daily cap per sender. The system enforces the cap automatically and rolls unused quota to zero each day (it does not carry over).
Building a clean list
Warmup protects your sending infrastructure. List quality protects your reputation. The two work together.
Bounce rate
Keep hard bounces below 2%. A bounce means the address doesn't exist or rejected your email permanently. Mailgun tracks this automatically. If you're importing a list older than 6 months, run it through an email verifier before loading it into Konvox.
Spam complaint rate
Gmail's postmaster tools treat anything above 0.3% as a red flag. Above 0.1% consistently means something is wrong. Every contact added to Konvox should have explicitly opted in to receive outreach from you.
Unsubscribes
Konvox processes opt-out keywords automatically in inbound emails ("unsubscribe", "stop", "remove me", and equivalents in Czech and Slovak). The contact's status is set to unsubscribed and all active enrollments pause. Don't fight the signal: a contact who wants off your list is not a prospect.
Email authentication
Konvox handles authentication on the konvox.io domain. Here's what's in place:
| Record | Purpose | Status |
|---|---|---|
| SPF | Authorizes Mailgun servers to send on behalf of your subdomain | Active |
| DKIM | Cryptographic signature that receivers use to verify the message wasn't tampered with | Active |
| DMARC | Policy that tells receivers what to do with mail that fails SPF or DKIM | Active |
If you use a custom sending domain in the future, you'll need to add these records yourself. Contact support and we'll walk you through it.
Practical habits
- Send to contacts in segments, not all at once. 20 contacts per day on a new address is plenty during warmup.
- Personalize subject lines and openers. Generic blasts tank reply rates and hurt your reputation.
- Keep emails short during warmup: 100 to 200 words, one ask per email. Long HTML-heavy emails score worse with spam filters.
- Monitor the warmup percentage in the Sender emails dashboard. If it stalls, check that campaigns are actually running.
- Don't add purchased or scraped lists. Contacts should have had some interaction with you or your brand.
- Space follow-ups at least 3 days apart. Back-to-back messages to the same person increase complaint rates.
What to do if you land in spam
Pause the affected campaign immediately. Sending more while flagged makes recovery slower.
Check your bounce rate in the Sender emails dashboard. If it's above 2%, clean the list before resuming.
Review subject lines and body copy for spam trigger patterns: excessive caps, too many links, "free", "guaranteed", "no risk".
Lower the daily cap for the sender by 50% and let the warmup counter accumulate a few more days before ramping back up.
Create a new sender address if the issue persists. A fresh address takes 14 days to warm but starts clean.