SaaS Outbound, Run Through Smartlead
For most SaaS companies, outbound is a primary growth channel — but the two halves of it live in different places. Smartlead is where your sequences, inbox rotation, and reply handling happen. ColdRelay is the infrastructure underneath: the secondary domains, mailboxes, and dedicated IPs that Smartlead actually sends from.
This guide covers how SaaS teams wire the two together — provisioning sending infrastructure on ColdRelay, importing it into Smartlead, and structuring sequences that book demos without ever touching your primary @company.com domain.
Why Run Smartlead on ColdRelay Infrastructure
Smartlead is a sending and sequencing platform — it sends from whatever mailboxes you connect to it. It doesn't provision domains or guarantee the deliverability of the mailboxes themselves; that's the infrastructure layer's job.
That's exactly where ColdRelay fits. Instead of buying Google Workspace seats at $6-7 each and configuring DNS by hand, you order dedicated mailboxes on isolated Azure tenants with dedicated IPs, fully DNS-configured (SPF, DKIM, DMARC) and ready in about an hour. You connect those mailboxes to Smartlead and start sending.
The pairing is additive, not competitive: ColdRelay is the infrastructure, Smartlead is the sender on top. You keep Smartlead's sequencing, A/B testing, and unified inbox — you just give it mailboxes built to land.
Visit Smartlead →Connecting ColdRelay Mailboxes to Smartlead
Provision mailboxes on ColdRelay
Pick secondary domains related to but separate from your primary SaaS domain. ColdRelay supports 100-150 mailboxes per domain — most SaaS teams start with 50-200 mailboxes across 1-3 domains. Everything provisions on isolated Azure tenants with dedicated IPs in about an hour, with SPF, DKIM, and DMARC already configured.
Export the mailbox credentials
From the ColdRelay dashboard, export your mailbox list with SMTP/IMAP credentials. ColdRelay's CSV export matches the column layout sending platforms expect, so there's no manual reformatting.
Add the mailboxes in Smartlead
In Smartlead, go to Email Accounts → Add Account → connect via SMTP/IMAP (or bulk-import the CSV). Each ColdRelay mailbox connects as its own sending account so Smartlead can rotate across all of them.
Set per-mailbox sending limits to match
Set each mailbox's daily limit in Smartlead to 2 outbound emails per day to mirror ColdRelay's per-mailbox budget — 4 sends/day total per mailbox, split 2 outbound + 2 warmup. Leave warmup to ColdRelay's network rather than double-warming inside Smartlead.
Build the sequence and launch
Create your campaign in Smartlead, attach all connected mailboxes, and let Smartlead rotate sends across them. With 50 mailboxes you have 100 outbound sends/day of capacity; scale mailboxes on ColdRelay as pipeline demands grow.
The SaaS Smartlead Playbook
Protect the product domain
Run every cold sequence from ColdRelay secondary domains in Smartlead — never your primary domain. Onboarding, billing, and support email stay completely isolated from outbound reputation risk.
Sequence to the demo, not the sale
SaaS cold email converts on a low-friction CTA. Structure Smartlead steps around a 15-minute demo ask, not a hard pitch — and use Smartlead's conditional steps to branch on opens and replies.
Segment by ICP in separate campaigns
Run distinct Smartlead campaigns per persona (founder, VP Eng, RevOps) so copy and benchmarks stay clean. Pull the same ColdRelay mailbox pool across them — capacity is shared, messaging is not.
Watch reply sentiment, not just opens
Smartlead's unified inbox is where demos actually get booked. Staff it daily; a same-day reply to an interested prospect is worth more than another 500 sends.
Typical SaaS Outbound Benchmarks (Smartlead + ColdRelay)
| Metric | Benchmark | Notes |
|---|---|---|
| Inbox placement rate | 95%+ | Dedicated IPs and isolated tenants outperform shared Google/Microsoft pools |
| Reply rate | 2-5% | Tight ICP targeting + a demo-first CTA; varies by persona seniority |
| Outbound capacity per mailbox | 2/day | 4 sends/day total per mailbox — 2 outbound + 2 warmup |
| Time to first campaign | Same day | ~60 minutes to provision, plus sequence setup in Smartlead |
| Domain reputation risk to product domain | Zero | Outbound runs entirely on separate ColdRelay infrastructure |
What It Costs: Smartlead + ColdRelay
You pay per mailbox per month for the infrastructure, with volume tiers that drop as you scale (see the table below). DNS, IPs, and isolated Azure tenants are included.
Smartlead is billed separately on its own subscription for sequencing, inbox rotation, and the unified inbox — priced per its current plans.
Infrastructure cost scales with mailbox count; Smartlead's cost scales with seats and features. The two stack cleanly — 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; Smartlead handles the sending, sequencing, and inbox rotation on top.
Frequently Asked Questions
Does ColdRelay replace Smartlead?
No. They do different jobs. Smartlead handles sequencing, inbox rotation, and reply management. ColdRelay provides the underlying domains, mailboxes, and dedicated IPs that Smartlead sends from. You use them together.
Will running cold email through Smartlead hurt our main SaaS domain?
Not when the mailboxes come from ColdRelay. Outbound runs on separate secondary domains, dedicated IPs, and isolated Azure tenants — completely walled off from your primary @company.com domain used for product and support email.
Do I still need Smartlead's warmup if I use ColdRelay?
ColdRelay mailboxes run their own warmup — 2 warmup sends/day per mailbox as part of the 4/day budget. You generally don't need to double-warm inside Smartlead; point Smartlead at outbound sending only.
How many mailboxes does a SaaS team need in Smartlead?
It depends on outbound volume. At 2 outbound sends/day per mailbox, 50 mailboxes gives 100 sends/day, 200 gives 400/day. Early-stage teams often start at 50-100 and scale mailboxes on ColdRelay as pipeline targets grow.