About Collect
Collect helps businesses gather documents from their clients, so nobody has to chase files over email. Cold email is its second biggest channel, run by a small team, and 85,000 to 100,000 emails go out every month.
Before Mailpool
It didn’t start that way. Like most teams, Collect began by sending cold email from the addresses the team already had, its own company inboxes. That works while the volume is small.
It stops working as outbound grows. Every cold email sent from the main domain puts the company’s own reputation on the line, and each address can only send so much before providers start to push back. Alex Delivet, Collect’s founder, could see that ceiling coming. The team wanted to send more, and the only safe way to do it was to move sending off the company domain, onto separate domains and mailboxes built for the job.
The 8-inbox trial
Collect started small, with 8 inboxes on separate sending domains set up on Mailpool.
The real question was never whether 8 inboxes would work. It was whether the setup behind them could be trusted with much more. The support held up, the mailboxes held up, and so did the infrastructure.
The campaigns worked, and then volume became the limit. The team could do more than 8 inboxes allowed, so in November 2025 Collect started adding capacity, with inboxes ready to go and rotated in and out as campaigns needed them.
Collect on Mailpool today
Collect added mailboxes in steps rather than all at once. By April 2026, five months in, it was past 100. Today it runs 187 mailboxes across 48 sending domains, about 70% on Google Workspace and 30% on Microsoft 365.
It grew by adding mailboxes, not by pushing each one harder, and it keeps spare capacity so inboxes can be rotated in and out. The setup has held up. In recent seed placement tests, about 93% of Collect’s emails land in the inbox, not in spam.
The takeaway
Collect never waits until it needs capacity to go and build it. Spare inboxes sit ready, and the team rotates them in and out as campaigns call for them. That’s why sending capacity grew 23 times over in about 10 months without anything breaking along the way.
That’s the lesson for other teams. Don’t size your infrastructure for the handful of inboxes you need this month. Start with what your sales stack actually needs, on a setup you can trust to grow with you, and keep a little more capacity than you’re using. Then the only question left is how far you want to go.
