Email routing
Split email delivery: one domain, two email systems.
Route each recipient at your domain to the right platform — Google Workspace for one team, Microsoft 365 or cost-effective mailboxes for another — with authentication intact and nothing lost in between.
- Recipient-based email routing on a single domain
- Split delivery or dual delivery, designed to fit
- SPF, DKIM and DMARC engineered to survive both paths
- Tested with real senders before handover
Built by email specialists
Split delivery is a routing design problem, not a checkbox. Tell us what your teams use today and we’ll map the routing, the authentication, and the switchover — in writing.
How split email delivery works
One domain, one set of addresses — two systems behind it.
1. A primary server receives
Your domain’s MX records point at one primary system, which accepts all incoming mail for the domain first.
2. Routing rules decide
Each recipient is matched against explicit rules: local mailboxes are delivered in place, everyone else is passed to the second system — per address, per team, or per department.
3. Both paths authenticate
SPF, DKIM and DMARC are configured so mail delivers cleanly on both systems — including the second hop, where careless setups silently bounce strict senders.
Why businesses choose split delivery
Cost optimization
Premium Workspace or Microsoft 365 seats only for the people who use them — everyone else on affordable mailboxes at the same domain. One address space, two price points, a licence bill that finally matches reality.
Complex email requirements
Departments standardised on different platforms, subsidiaries sharing one domain, a single team with regulated retention — dual email delivery and per-recipient routing make one domain serve all of it.
Migration without a big-bang cutover
Moving provider is the classic use: run old and new side by side, migrate group by group, verify everything arrives, and only then move the MX. Nobody loses a day of email.
The right platform per team
Sales lives in Gmail; operations will not leave Outlook. Split delivery ends the argument — both teams keep their tools, and every address stays [email protected].
Routing that respects deliverability
Email deliverability is our specialty, and split delivery is where deliverability mistakes hide. A second delivery hop can hard-bounce mail from senders with strict SPF policies — invisibly, and only for some senders. We design the routing so authentication survives both paths, then prove it with real test senders before handover.
Split email delivery FAQs
What is split email delivery?
Split email delivery routes incoming messages for a single domain to two different email systems based on the recipient. Mail arrives at a primary server first; recipients who live on the second platform are passed straight through to it.
What is the difference between split delivery, dual delivery and email routing?
Email routing is the umbrella: rules that decide where a message goes. Split delivery sends each recipient to exactly one of two systems; dual delivery copies messages to both systems at once, which is common during migrations and testing.
Can I run Google Workspace and Microsoft 365 on the same domain?
Yes — that is the classic split delivery case. Sales can live in Gmail while operations stays in Outlook, all on the same addresses at your domain.
Does split delivery break SPF, DKIM or DMARC?
Done carelessly, it can — a second hop can hard-bounce mail from strict-SPF senders. We design the routing so authentication survives both paths, and we verify it with real senders before handover.
Is split delivery only for migrations?
No. Migrations are one use, but plenty of businesses run it permanently — to keep premium licences for a few users, to give departments different platforms, or to meet retention rules for one team only.
Will messages get lost between the two systems?
Not in a correct setup. The primary server has an explicit rule for every recipient, unknown addresses are rejected predictably, and we test both paths before anything goes live.
How much does split email delivery cost?
It is scoped and quoted in writing — the design depends on your platforms and mailbox count. In most cost-optimization setups the routing pays for itself by reducing per-seat licence spend.
How we handle access
We work from a named, least-privilege account you create for us, require multi-factor authentication on anything we touch, capture the prior state before every change, and hand you a written revocation checklist when the work is done. One company — TK WebHosts Ltd — provides the service, invoices you and carries the liability.
Two email systems. One domain. Zero guesswork.
Tell us what your teams use today and what it costs — we’ll come back with a routing design and a written quote.
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