01
Setting up the mailbox the week of the raise
A brand-new mailbox whose first act is emailing strangers looks exactly like a spammer. Connect it four to six weeks out and let warmup give it a history.
How warmup worksUse cases · Fundraising
Warm up now. Send when the deck is ready.
Investor outreach fails for one boring reason: the mailbox was set up the week of the raise. Start six weeks out, and on launch day your email lands in the inbox, not the promotions tab.
- 6 weeks outConnect and warm
Warmup starts at 10 a day and climbs by one a day.
- 4 weeks outWrite the sequence
Two emails, plain text, one ask.
- 2 weeks outBuild the list
Partners who actually lead rounds like yours.
- Launch weekSend
Inside each partner’s working hours, spaced out.
- AfterReply fast
Every reply lands in one inbox, ready for the deck.
Three mistakes. How founders burn their domain mid-raise.
02
Copying your co-founders on every email
A cold email with a wall of names reads as bulk mail. Write one to one, and bring the team in once a partner replies.
How the inbox works
03
Sending to the whole list at 9am Tuesday
Dozens of near-identical emails in one minute is the loudest spam signal there is. Spread them across each partner’s own working day.
How sending is pacedThe sequence. Two emails. The second is a reply to the first.
A partner who answers either one is taken out of the sequence straight away, so nobody gets a follow-up after saying yes or no.
Their working hours. Land in each partner’s morning, wherever they are.
Turn on send-time optimization and each email waits until the partner’s own clock reaches the hours you pick. Warmbly reads the contact’s timezone field first, then the country their email domain points at, then your fallback.
- It only ever delays a send, never brings one forward.
- The campaign window, the daily cap and the gap between sends still apply.
- Weekends can roll over to Monday.
When they reply. The sequence stops, and the thread is yours.
A reply lands in one inbox, labelled by what the partner wants, and their place in the campaign ends there. Meanwhile Warmbly keeps watching the mailbox for you.
- 10%
- Spam placement
- The point where warmup slows down to protect the mailbox.
- 0.10%
- Complaints
- The point where the mailbox is paused and pulled from the pool.
- 0
- Follow-ups after a reply
- A partner who answers is out of the sequence at once.
Questions. Fundraising, answered.
How long before the raise should I connect the mailbox?
Four to six weeks. Warmup reaches 40 emails a day after about a month, and while a mailbox is still warming it sends at most 5 cold emails a day.
How short should an investor sequence be?
Shorter than you think. Partners get hundreds of these a week, so one strong first email and a single follow-up in the same thread do most of the work. A reply stops the sequence for that partner.
Should I attach the deck to the first email?
No. A cold attachment hurts deliverability, and it takes away their reason to reply. Send a few sentences and an ask, then the deck once they answer.
Should I send from my main domain?
Use a sending sub-domain, so a complaint on cold mail never touches the inbox you run the company from. The founder setup walks through it.
What if a partner marks it as spam?
Complaints are tracked per mailbox. A spam complaint suppresses that address, and if complaints climb, the mailbox is slowed down or paused before it can damage your domain.
Start warming six weeks before the raise.
Connect the mailbox today and it will be ready by the time the deck is.