Outbound that does not burn your primary domain.
The mistake that costs B2B teams the most is running cold outreach from the same domain that sends product email. When outreach draws complaints, the reputation damage lands on the domain your password resets, invoices and onboarding emails also use.
What goes wrong, and what handles it.
Cold outreach damages the domain your product email uses
Send outbound from separate authenticated domains, connected as their own sending accounts. Your primary domain stays out of the campaign path entirely, so reputation damage cannot reach transactional mail.
Google Workspace and Microsoft 365 cut you off mid-campaign
Volume is distributed across every connected mailbox with a randomised 25–45 second gap, holding each account near 80–144 emails an hour. An account that does hit a limit is cooled down for 60 minutes and skipped while the rest keep sending.
Identical messages to a large list get pattern-matched
Spintax produces a different phrasing per recipient and CSV mail merge personalises from your own data, so a campaign is not thousands of byte-identical copies.
Gmail and Yahoo bulk sender rules apply to you now
Every campaign carries an RFC 8058 one-click unsubscribe header, and opt-outs plus hard bounces enter the suppression list automatically.
How a campaign runs.
- 01
Register one or more dedicated outbound domains, kept separate from your product domain.
- 02
Authenticate each with SPF, DKIM and DMARC, verified by the built-in DNS checker.
- 03
Connect a few mailboxes on each domain to spread volume.
- 04
Import and validate your prospect list, with MX lookups confirming the receiving domains accept mail.
- 05
Write once with Spintax variants and merge fields, then send across the whole pool.
- 06
Watch opens and clicks land in real time and iterate on what actually gets replies.
Where this is not the right tool
This is a campaign sender, not a sales engagement platform. There are no multi-step sequences, no automatic follow-up until reply, no unified reply inbox and no CRM sync. If your motion depends on a five-touch cadence with reply detection, a dedicated sequencing tool is the right purchase.
Questions from b2b saas teams.
Setup, limits and the things worth knowing before you commit.
Should outbound really use a different domain?
Yes, and it is the single highest-value change most B2B teams can make. Cold outreach attracts complaints even when done well. Isolating it on a separate authenticated domain means that when reputation takes a hit, your password resets, receipts and product notifications are unaffected.
Does it send follow-up sequences?
No. It sends campaigns. Follow-up cadences with reply detection are a different product category, and running each touch as a separate campaign against a manually maintained list is workable but clumsy at scale.
How much can we send per day?
Roughly 80 to 144 emails per hour per connected mailbox, so it scales with how many you connect. Twenty-five mailboxes gives you around 2,000 to 3,600 an hour. Daily quotas reset at 00:00 UTC, matching how Google and Microsoft account for them.
Is cold email compliant?
It depends on where your recipients are. Some jurisdictions require prior consent for any commercial email; others allow contacting business addresses with clear sender identification and a working opt-out. You need accurate identification, a physical postal address and a functioning unsubscribe regardless. Our terms prohibit purchased or scraped lists.
Send a real campaign first.
Connect a mailbox, run your domain through the authentication checker, and see the results before you commit to a plan.
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