Deliverability Guide

Email Warming: The Key to Your Deliverability

Learn how to "warm up" your email addresses to stay out of spam and get the most deliverability out of your campaigns.

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95%
Deliverability rate after warming
2-3 wks
Average warming time
+40%
Improvement in open rate

What is email warming?

Email warming (or warm-up) is the process of gradually increasing the sending volume of a new email address to build its sender reputation.

Mailbox providers (Gmail, Outlook, Yahoo) use sophisticated algorithms to decide whether an email is legitimate or spam. A new address with no history is automatically suspicious.

Important

Without warming, up to 50% of your emails can land in spam, even with perfectly legitimate content.

Recommended warming schedule

1

Week 1

5-10/day

A gradual start with simple emails

2

Week 2

15-25/day

Higher volume, positive interactions

3

Week 3

30-50/day

Steady volume, reputation taking shape

4

Week 4+

50-100/day

Ready for cold email campaigns

How does Fluenzr warming work?

📤

Automatic sends

Fluenzr sends emails from your account to our network of partner accounts.

📥

Simulated replies

Emails receive opens, clicks and replies that strengthen your reputation.

⭐

Marked as important

Your emails are marked as "important" and pulled out of spam when needed.

📈

Gradual ramp-up

Volume increases automatically on an optimized schedule.

Mailbox warming is included in the subscription

With Fluenzr, warming your mailboxes is included in the subscription, free for 14 days when you sign up (no card for email; a card is only requested to connect LinkedIn, and nothing is charged before the trial ends). Start building your reputation today.

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Frequently asked questions about warming

What is email warming?

Email warming (or email warm-up) is the process of gradually increasing the sending volume of a new email address. The goal is to build a sender reputation with mailbox providers (Gmail, Outlook, etc.) so you don't land in spam.

How long does warming take?

Warming usually takes 2 to 4 weeks for a new email address. During that time, sending volume rises gradually from a few emails a day to 50-100 emails daily.

Is warming mandatory?

If you use a new email address or a new domain for cold email, warming is strongly recommended. Without it, your emails are likely to land in spam from the very first send.

How does Fluenzr's automatic warming work?

Fluenzr automatically sends emails between accounts in our network. Those emails get opened, marked as important and receive replies, which builds your sender reputation naturally.

Can I send campaigns while warming?

Yes, but in limited volume. Start with 5-10 outreach emails a day and increase gradually alongside the warming.

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