Use cases · Founders

Cold email for founders, without risking founder@.

You are the best person to sell what you’re building, but your own inbox is too valuable to burn. This is the setup that keeps it safe and still sends about 150 emails a weekday.

Start free See the setup
Mailboxes
3 + 1
Ready in
~a month
A weekday
~150

Why not just use your inbox? Three ways one inbox lets a founder down.

  1. 01

    One inbox carries everything

    Your investor threads, your data room links and your fiftieth cold pitch of the day share one reputation. One complaint costs you the inbox you run the company from.

  2. 02

    Replies wait for you

    A warm reply that sits for a day is a deal cooling off. With every mailbox in one inbox, sorted by what each reply wants, the good ones stop slipping past.

  3. 03

    One mailbox hits a ceiling

    A mailbox sends around 50 cold emails a day safely. Push everything through one and you run into the provider’s limits long before your goals.

The setup. Six steps, most of them done once.

Do the first four in an afternoon, then let warmup run while you write the sequence.

TodayWeek 3 to 6
1 to 34 · warmup runs on its ownfirst send
Steps 5 and 6 happen while the mailboxes warm.
One afternoon
  1. 1

    Send cold from a sub-domain

    out.acme.com

    Reputation follows the sub-domain, so a complaint on cold mail never touches founder@ on your main domain.

  2. 2

    Open three cold mailboxes

    hello@ · intro@ · team@

    Three senders share the volume and the risk. founder@ stays on the main domain for real mail.

Then three to six weeks
  1. 3

    Publish SPF and DMARC

    v=DMARC1; p=quarantine; …

    Warmbly checks both on the sub-domain and spells out the record to add if one is missing.

  2. 4

    Warm all four mailboxes

    10 a day, +1 a day, up to 40

    Expect three to six weeks. While a mailbox is still warming it sends at most 5 cold emails a day.

While it warms
  1. 5

    Write in plain text

    no HTML, no tracking image

    A founder writing by hand doesn’t send a designed newsletter. Plain text reads as a person.

  2. 6

    Judge by replies, not opens

    reply rate per mailbox

    Opens are muddied by privacy proxies. Replies, and each mailbox’s health, tell you what is working.

A week, once warmed. 750 cold emails, and founder@ sends none of them.

Three mailboxes at the default of 50 a day, Monday to Friday. founder@ keeps warming in the background and carries only the mail you write yourself.

Questions. Founders, answered.

Why a sub-domain instead of more mailboxes on my main domain?

A sub-domain like out.acme.com builds its own reputation at Gmail and Outlook. If cold mail draws a complaint, your main domain and the founder@ inbox are untouched. The setup is the same records, just on the sub-domain.

Can I use founder@ for cold email if I’m careful?

We wouldn’t. Once founder@ takes a reputation hit, your contracts, data room links and investor threads start landing in tabs or spam. Keep it for real mail.

How soon can I send a real campaign?

Plan on three to six weeks of warmup. Warmup reaches 40 a day after about a month, and until a mailbox is warmed it sends at most 5 cold emails a day, so starting early matters more than anything else.

How many emails a day will this setup send?

About 150 a weekday once all three cold mailboxes are warmed, at the default of 50 each. That fits the Starter plan.

Start the founder setup today.

Connect your sub-domain, add the mailboxes and have warmup running before the day ends.

Start free See pricing