How Snov + ColdRelay Work Together
ColdRelay (Infrastructure)
ColdRelay provides the mailboxes Snov.io sends from. Each mailbox is a Microsoft 365 account inside a dedicated, isolated Azure tenant with its own dedicated IP, fully-automated DNS (SPF, DKIM, DMARC), and a 95% inbox-placement guarantee. ColdRelay's pricing is per-mailbox: $1 (1-199), $0.85 (200-999), $0.70 (1K-4,999), $0.55 (5K+). Setup completes in 60 minutes, no warmup wait.
Snov (Sending Platform)
Snov.io is an all-in-one outreach platform — email finder, email verifier, drip campaign sequencer, and lightweight CRM in one tool. Snov.io is best known for its 400M+ contact database and Email Finder, but the Email Drip Campaigns feature is what actually sends cold email at scale. Snov.io does NOT provide the mailboxes themselves; you connect your own via SMTP/IMAP and Snov.io orchestrates the sends.
Why use them together
Snov.io is the brain (lead-gen + sequences + CRM). ColdRelay is the body (mailboxes, IPs, DNS). The combination gives you a clean separation: Snov.io handles lead sourcing and campaign logic, ColdRelay handles infrastructure quality. Switching either side later is straightforward because they're loosely coupled — your ColdRelay mailboxes work with any sender that supports custom SMTP/IMAP.
Connect Snov to ColdRelay (Step-by-Step)
- 1
Order ColdRelay mailboxes
Sign up at coldrelay.com/sign-up, pick a domain (ColdRelay handles registration for $14), and order your mailbox count. The minimum is 50 mailboxes ($50/month at the base tier). ColdRelay's automation provisions the dedicated mail server, registers the domain, and creates all mailboxes inside an isolated Azure tenant.
Note: Provisioning takes 60 minutes end-to-end. You'll receive a CSV with every mailbox's SMTP host, port, username, and password once it's complete.
- 2
Wait for DNS propagation
ColdRelay configures SPF, DKIM, and DMARC records automatically on the new domain. DNS propagation usually completes in under an hour but can take up to 24. Verify with the Email Deliverability Test at coldrelay.com/tools/email-deliverability-test — when SPF, DKIM, DMARC, and MX all show as configured, you're ready to connect to Snov.io.
Note: Don't start sending before all four records (SPF, DKIM, DMARC, MX) verify correctly. Sending without authentication in place causes immediate spam-folder placement and can damage the domain's long-term reputation.
- 3
Connect mailboxes to Snov.io via SMTP/IMAP
In Snov.io, go to Email Accounts → Add Account → Other (Custom SMTP/IMAP). For each ColdRelay mailbox, enter the sender name, then paste the SMTP host (box.YOURDOMAIN.com), SMTP port (587), encryption (STARTTLS), username (the full email address), and password from the ColdRelay CSV. Repeat for IMAP on port 993 with SSL/TLS. Snov.io runs a test send and marks the mailbox as Active once it validates.
Note: Snov.io's Gmail and Outlook OAuth flows do NOT apply here — ColdRelay mailboxes are M365 mailboxes on your isolated tenant, not consumer Outlook accounts. Always use the Custom SMTP/IMAP path.
- 4
Set daily sending limits per mailbox
In each Snov.io mailbox's Sending Settings, set the daily limit to 2 outbound emails per day. This matches ColdRelay's per-mailbox cap (designed for optimal deliverability, not maximum volume). With 50 mailboxes you can send 100 outbound emails/day; 200 mailboxes = 400/day; 1,000 mailboxes = 2,000/day. Also set a per-email delay of 60-120 seconds between sends so Snov.io spaces them naturally across the day.
Note: Going higher than 2/day/mailbox is the single fastest way to degrade deliverability. ColdRelay's pricing model assumes 2/day — if you need 5,000+ emails/day, add more mailboxes, don't push existing ones harder.
- 5
Add Snov.io's email warmup tool
Snov.io's Email Warm-up is a separate add-on subscription (priced per mailbox warmed). Enable it on each ColdRelay mailbox you've connected, set the daily warmup volume to 2 emails/day, and let it run for the first 2 weeks alongside your outbound campaigns. Warmup ramps up reputation by exchanging emails with other Snov.io warmup-network mailboxes and auto-marks them as important.
Note: ColdRelay mailboxes ship reputation-ready (the Azure tenant + dedicated IP isolation gives you a clean start), but warmup is still recommended for the first 2 weeks of active sending. Combined cap: 2 outbound + 2 warmup = 4 emails/day MAX per mailbox.
- 6
Build a drip campaign
In Snov.io, go to Campaigns → Create New Campaign. Import your prospect list (or use Snov.io's Email Finder to source new ones), build your sequence on the visual drag-and-drop editor (subject + body + follow-up triggers like opened/replied/clicked), and assign your ColdRelay mailboxes as the sending accounts. Snov.io distributes sends across all assigned mailboxes respecting each one's daily cap.
Note: Use variable spintax in subject lines and opening sentences to avoid mailbox fingerprinting. The Spintax Generator at coldrelay.com/tools/spintax-generator generates the syntax. Snov.io's variable placeholders use {{snippet}} format.
- 7
Verify your prospect list before launching
Snov.io includes a built-in Email Verifier — run your prospect list through it before launching the campaign. Removing invalid and catch-all addresses upfront protects your sender reputation. ColdRelay mailboxes are robust, but a high bounce rate (5%+) flags any sending platform's IP as spammy at Gmail and Outlook, undoing the dedicated-IP advantage.
Note: Snov.io charges credits per verification (typically 1 credit per email verified). Budget this into your monthly Snov.io plan, especially for large lists from purchased databases.
- 8
Monitor deliverability ongoing
Run the Email Deliverability Test weekly to verify SPF/DKIM/DMARC stay passing. Check Snov.io's campaign analytics (open rate, reply rate, bounce rate) and Google Postmaster Tools for spam-folder rates and IP reputation. ColdRelay automatically monitors blocklists — you'll get an alert if any of your dedicated IPs hit a major blocklist (Spamhaus, Barracuda, SORBS, SpamCop).
Note: ColdRelay's 95% inbox-placement guarantee is contingent on following the 2/day/mailbox cap. Exceeding the cap voids the guarantee. If Snov.io's analytics show open rates below 30% or bounce rates above 3%, pause and re-check authentication + list quality before continuing.
Key Considerations for Snov + ColdRelay
Daily send limits per mailbox
Set Snov.io's per-mailbox daily limit to 2 outbound + 2 warmup = 4 total/day MAX. This is ColdRelay's optimal-deliverability cap. Going higher is the single biggest cause of mailbox burnout we see. Scale total volume by adding more mailboxes, not by pushing existing ones harder. Snov.io's UI lets you cap each mailbox independently — use it.
Dedicated IPs end shared-IP risk
Each ColdRelay mailbox is on a dedicated IP within your isolated Azure tenant. Snov.io users on cheap shared mailbox providers (Gmail aliases, basic M365 plans, etc.) are sharing IP reputation with random other senders — bad actors on the same IP damage everyone's deliverability. With ColdRelay your IP reputation is entirely your own.
Snov.io's warmup is a paid add-on
Unlike some senders that bundle warmup into the core plan, Snov.io charges separately for Email Warm-up. Budget this into your stack: if you have 200 ColdRelay mailboxes, you'll be paying for 200 warmup slots inside Snov.io. The per-mailbox warmup cost is typically less than the per-mailbox infrastructure cost, but it's not free.
Snov.io's CRM keeps replies in one place
Snov.io includes a lightweight CRM that aggregates replies from all connected mailboxes. ColdRelay's IMAP setup is standard — Snov.io polls each mailbox's IMAP at port 993 and surfaces replies into the CRM normally. No special configuration needed. Replies show up in Snov.io's unified inbox view, separated by campaign.
Switching cost is low
If you decide Snov.io isn't right and want to switch to Instantly, Smartlead, Reply.io, or another sender later, your ColdRelay mailboxes work with any platform that supports custom SMTP/IMAP. You don't lose the infrastructure investment. The Snov.io campaign data (sequences, contact tags, reply history) stays with Snov.io, but the mailboxes are portable.
Domain-rotation strategy
ColdRelay caps each domain at 100-150 mailboxes for deliverability reasons. If you need 500+ mailboxes, you'll order multiple domains. Snov.io handles multi-domain campaigns natively — assign mailboxes from each domain to different campaign tracks to spread risk. This also lets you test subject-line + offer variations across domains without cross-contamination.
Pricing Snapshot
ColdRelay
ColdRelay's per-mailbox cost ranges from $1.00 (1-199 mailboxes) down to $0.55 (5,000+). Domain registration is $14/year, one-time. For 200 mailboxes: 200 × $0.85 = $170/month + $14 annual domain cost.
Snov
Snov.io's pricing is credit-based and tiered. Starter (~$30/month) covers 1,000 credits + basic drip campaigns. Pro plans (~$75-$150/month depending on credit volume) unlock unlimited campaigns, team seats, and higher credit ceilings. Snov.io also offers Managed Service at a custom monthly retainer for done-for-you setup and campaign management. Email Warm-up is billed separately per mailbox warmed.
Total monthly
A typical 200-mailbox cold email operation: ColdRelay infrastructure at ~$170/month + Snov.io Pro at ~$99/month + Snov.io Warm-up (200 mailboxes) = approximately $300-$350/month total. At 1,000 mailboxes: ColdRelay $700/month + Snov.io Pro at the higher credit tier + warmup ≈ $1,100-$1,300/month. Compare against Google Workspace at $6+/mailbox/month: 200 GW mailboxes alone would be $1,200/month before Snov.io's sender cost.
Common Issues + Fixes
⚠ Snov.io rejects the SMTP credentials with 'Authentication failed'
The most common cause is a typo in the username or password from the ColdRelay CSV. The username is the FULL email address (user@yourdomain.com), not just the part before the @. Copy-paste directly from the CSV — don't retype. If credentials are correct, verify port 587 with STARTTLS encryption (not port 465 with SSL). ColdRelay mailboxes do not support implicit SSL on 465.
⚠ Test send works but actual campaign sends fail with 'Daily limit reached'
Snov.io enforces its own per-mailbox cap separately from ColdRelay's recommendation. Check both: the mailbox's Sending Settings in Snov.io (should be set to 2/day) and the campaign-level setting (which can override). If both look right, check whether Snov.io is counting warmup emails against the outbound cap — they're separate counters but some plan tiers conflate them. Contact Snov.io support if the math doesn't add up.
⚠ Emails landing in spam at Gmail despite passing SPF/DKIM/DMARC
Run the Email Deliverability Test against the domain. If SPF, DKIM, or DMARC fails, the records may not have propagated yet — wait 24 hours. If they all pass, check Google Postmaster Tools for the domain's spam-rate metric. The most common cause of post-authentication spam placement is exceeding the 2/day/mailbox cap, or campaign content triggering Gmail's spam filters (link density, spammy keywords, image-heavy HTML). Use the CAN-SPAM Checker at coldrelay.com/tools/can-spam-checker to validate.
⚠ Snov.io's unified inbox shows no replies even though prospects are replying
Snov.io polls IMAP on port 993 with SSL/TLS. Verify the IMAP credentials match the ColdRelay CSV — most commonly, the IMAP password is the same as the SMTP password but it can drift if a mailbox was reset. Re-test in Snov.io's mailbox settings (Test Connection button). Also check that the mailbox is set to 'Active' in Snov.io and that the campaign is configured to track replies.
⚠ Bounce rate climbing above 3% on a new campaign
This is almost always a list quality issue, not infrastructure. Run the prospect list through Snov.io's Email Verifier before launching — it will flag invalid, catch-all, and disposable addresses. A clean list typically bounces at less than 1%. If bounces persist after verification, the list may be aged (data older than 6 months bounces more) or sourced from a low-quality provider. Pause the campaign before bounces damage the dedicated IP's reputation.
Frequently Asked Questions
Do I need ColdRelay if I already have Snov.io?
Snov.io is a lead-gen + sending platform — it doesn't provide mailboxes or DNS infrastructure. You need an infrastructure provider (ColdRelay, Google Workspace, etc.) underneath it. Most Snov.io users start with Google Workspace mailboxes ($6+/mailbox/month) and switch to ColdRelay because the infrastructure is purpose-built for cold email at a fraction of the cost ($0.55-$1.00/mailbox).
Is ColdRelay better than Google Workspace for use with Snov.io?
For cold email at any scale beyond a handful of mailboxes: yes. Google Workspace charges $6+/mailbox/month and shares some risk across all GW senders. ColdRelay charges $0.55-$1.00/mailbox/month, gives each customer a dedicated Azure tenant with dedicated IPs, and bakes SPF/DKIM/DMARC automation into provisioning. The infrastructure quality is closer to enterprise-grade at indie-tool prices, which pairs especially well with Snov.io's lead-gen volume.
How many mailboxes do I need to scale to my target send volume?
ColdRelay's per-mailbox cap is 2 outbound emails/day for optimal deliverability. So if you want to send 1,000 emails/day, you need 500 mailboxes. The Mailbox Calculator at coldrelay.com/tools/mailbox-calculator lets you input your target volume and gives you the exact mailbox count + pricing tier. Combine this with Snov.io's credit calculator to forecast the full monthly cost.
Can I use ColdRelay with Snov.io's Starter plan?
Yes, but Snov.io's Starter plan caps you at 1,000 credits and limited campaign features, which won't go far at meaningful volume. The Snov.io + ColdRelay combination really shines on Snov.io's Pro plans, where unlimited campaigns and higher credit ceilings unlock the volume that ColdRelay's mailbox count is built for.
Will my Snov.io campaigns break if I switch to ColdRelay from another provider?
No. Switching infrastructure providers mid-campaign requires reconnecting each mailbox in Snov.io (new SMTP/IMAP credentials), but campaign logic, sequences, contact tags, and reply history stay intact. The transition takes a few minutes per mailbox. We recommend pausing campaigns during the swap to avoid any deliverability blips, then resuming once all mailboxes show Active in Snov.io.
Does ColdRelay integrate with Snov.io's API to push mailboxes automatically?
ColdRelay's roadmap includes direct API push for Snov.io accounts. Today the workflow is: provision in ColdRelay, download the CSV, then bulk-paste into Snov.io's Add Account flow. For 50-200 mailboxes this takes about an hour. For larger volumes, contact ColdRelay support — there are bulk-import scripts that reduce the manual step significantly.
What if Snov.io's deliverability is bad with my ColdRelay mailboxes?
That's almost always a campaign-content or list-quality issue rather than an infrastructure issue. ColdRelay's 95% inbox guarantee means the infrastructure is doing its job. Run prospect lists through Snov.io's Email Verifier first, then validate campaign content with the CAN-SPAM Checker at coldrelay.com/tools/can-spam-checker and the Subject Line Generator. ColdRelay's deliverability consultant (included at higher volumes) can help diagnose specific issues.