Logistics Outbound, Run Through Instantly
Freight is a market-timing business. When capacity tightens on a lane or spot rates swing, shippers re-open routing decisions they'd locked in months ago — and the broker who reaches 2,000 of them that week wins the lanes. Miss the window by ten days and the conversation is over until the next swing.
That makes logistics outbound a volume-and-readiness problem, not a drip problem. Instantly is built for exactly this style of sending: unlimited email accounts on paid plans, bulk SMTP/IMAP import, and a campaign builder simple enough to keep a dozen lane-specific campaigns staged and ready. ColdRelay is the layer underneath — the secondary domains, mailboxes, and dedicated IPs that give Instantly the raw sending capacity to actually hit those numbers. This guide covers how brokers and 3PLs wire the two together so a market trigger turns into a live, full-volume campaign the same day.
Why Run Instantly on ColdRelay Infrastructure
Instantly removes the software ceiling on volume: paid plans let you connect unlimited email accounts, so the constraint on how many shippers you can reach in a week is never the platform — it's how many healthy mailboxes you can feed it. That's the infrastructure layer's job, and it's where most brokerages stall. Buying and configuring mailboxes seat-by-seat takes weeks, which is fatal when the market window you're chasing lasts days.
ColdRelay solves the capacity side. You order dedicated mailboxes on isolated Azure tenants with dedicated IPs, fully DNS-configured (SPF, DKIM, DMARC) and ready in about an hour — with no warmup waiting period before they can send. ColdRelay supports 100-150 mailboxes per domain, so a pool large enough to reach 2,000 shippers in a week fits on one or two secondary domains, and you can expand it mid-window if a campaign is converting.
The pairing is additive, not competitive: ColdRelay is the infrastructure, Instantly is the sending and sequencing layer on top. You keep Instantly's campaign builder, A/Z testing, Unibox, and analytics — you just back them with a mailbox pool sized for surge weeks instead of average weeks.
Visit Instantly →Connecting ColdRelay Mailboxes to Instantly
Size and provision the standing pool on ColdRelay
Work backwards from your surge-week target. Each mailbox sends 4 emails/day total — 2 outbound + 2 warmup — so reaching 2,000 shippers in a week takes roughly 145 mailboxes. ColdRelay supports 100-150 mailboxes per domain, so that pool fits on one or two secondary domains, provisioned on isolated Azure tenants with dedicated IPs in about an hour, SPF, DKIM, and DMARC pre-configured.
Bulk-import the pool into Instantly via CSV
Export the mailbox list with SMTP/IMAP credentials from the ColdRelay dashboard. In Instantly, use Email Accounts → Add New → Bulk Import via CSV to connect the entire pool in one upload — no per-account setup. Instantly's unlimited email accounts on paid plans means a 145-mailbox pool costs nothing extra on the software side.
Set sending limits to match the ColdRelay budget
Set each account's daily campaign limit in Instantly to 2 outbound emails per day, mirroring ColdRelay's per-mailbox budget of 4 sends/day total (2 outbound + 2 warmup). Warmup runs continuously on ColdRelay's side, so leave Instantly's accounts pointed at campaign sending only.
Pre-build one paused campaign per lane and mode
In Instantly's campaign builder, stage a campaign for each trigger scenario — reefer Midwest capacity crunch, ocean import GRI, produce season ramp — with the shipper list attached and A/Z variants loaded for the subject line and opening hook. Leave them paused. The work happens before the market moves, so launch day is one click, not a build sprint.
Launch on the trigger and manage the surge in Unibox
When the trigger hits, resume the matching campaign and let Instantly rotate sends across the full pool. Watch campaign analytics for which A/Z variant is winning and shift volume to it mid-week. Route all replies into Unibox — during a capacity crunch, shipper replies arrive in hours and expect quotes just as fast.
The Logistics Instantly Playbook
Build campaigns on build day, launch them on trigger day
The brokers who win market windows aren't faster writers — they finished writing weeks ago. Keep a library of paused Instantly campaigns, one per lane-and-mode scenario, each with its list and A/Z variants ready. When rates move, your competition starts drafting; you press resume.
Define your triggers before the market defines them for you
Decide in advance exactly what fires each campaign: a spot-rate jump past a set threshold on a lane you cover, tender rejection rates climbing, a port congestion alert, a carrier GRI announcement, produce season opening. A written trigger list turns 'should we send something?' debates into same-day launches.
Size the pool for the surge week, not the average week
If your steady-state outreach needs 40 mailboxes but a hot window demands reaching 2,000 shippers in a week, the pool you provision is the 145-mailbox one. At 2 outbound sends/day per mailbox (4/day total with 2 warmup), capacity math is simple — and because ColdRelay warmup runs continuously, the standing pool stays healthy between windows instead of going cold.
Quote out of Unibox at freight speed
A shipper replying during a capacity crunch is comparing options that day, not that quarter. Staff Instantly's Unibox like a load board during launch weeks: same-day replies with a concrete rate and committed capacity convert; a 48-hour lag hands the lane to whoever answered first.
Typical Logistics Outbound Benchmarks (Instantly + ColdRelay)
| Metric | Benchmark | Notes |
|---|---|---|
| Inbox placement rate | 95%+ | Dedicated IPs and isolated tenants outperform shared Google/Microsoft pools |
| Trigger-to-launch time | Same day | Pre-built paused campaigns in Instantly resume in one click when the market moves |
| Shippers reached per surge week | ~2,000 | 145-mailbox pool at 2 outbound sends/day per mailbox (4/day total — 2 outbound + 2 warmup) |
| Reply rate during a market window | 3-7% | Timing-hooked sends during rate swings outperform evergreen freight pitches at the same volume |
| Time to expand the pool mid-window | ~60 minutes | New ColdRelay mailboxes provision with DNS pre-configured and no warmup waiting period |
What It Costs: Instantly + ColdRelay
You pay per mailbox per month for the infrastructure, with volume tiers that drop as you scale (see the table below) — which matters here, because surge-sized pools land in the cheaper tiers. DNS, IPs, and isolated Azure tenants are included.
Instantly is billed separately on its own subscription, which covers the campaign builder, A/Z testing, Unibox, and analytics — with unlimited email accounts on paid plans, so pool size doesn't raise the software bill.
Infrastructure cost scales with mailbox count; Instantly's cost stays flat as the pool grows. For a volume-driven brokerage, that means the only real cost of surge capacity is the mailboxes themselves — one bill for sending capacity, one for the sending software.
| Mailboxes | ColdRelay price / mailbox / month |
|---|---|
| 1–199 | $1.00 |
| 200–999 | $0.85 |
| 1,000–4,999 | $0.70 |
| 5,000+ | $0.55 |
Each mailbox sends 4 emails per day — 2 outbound to prospects + 2 warmup. ColdRelay provisions mailboxes on isolated Azure tenants with dedicated IPs; Instantly handles the sending, sequencing, and inbox rotation on top.
Frequently Asked Questions
Does ColdRelay replace Instantly?
No — they're complementary layers of the same stack. Instantly handles campaigns, A/Z testing, account rotation, and replies in Unibox. ColdRelay provides the underlying domains, mailboxes, and dedicated IPs that Instantly sends from. Logistics teams use them together: Instantly on top, ColdRelay underneath.
How many mailboxes do I need to reach 2,000 shippers in one week?
About 145. Each ColdRelay mailbox sends 4 emails/day total — 2 outbound + 2 warmup — so 145 mailboxes deliver roughly 2,030 outbound sends over seven days. Since ColdRelay supports 100-150 mailboxes per domain, that pool fits on one or two secondary domains, and Instantly's bulk CSV import connects all of them in a single upload.
A rate swing just hit — how fast can I add sending capacity?
About an hour. New ColdRelay mailboxes provision on isolated Azure tenants with dedicated IPs, SPF, DKIM, and DMARC pre-configured, and there's no warmup waiting period before they can send — warmup runs continuously as part of each mailbox's 4/day budget (2 outbound + 2 warmup). Bulk-import the new credentials into Instantly via CSV and attach them to the live campaign the same day.
What happens to the mailbox pool between market windows?
It stays warm and ready. ColdRelay's warmup runs continuously — 2 warmup sends/day per mailbox regardless of whether campaigns are active — so a pool that sat quiet for three weeks launches at full volume the day a trigger fires, with no re-warming ramp. You can also keep a low-volume evergreen campaign running in Instantly so the pool's outbound budget never goes fully idle.