Vectis Mail for agencies.
Run mail for every client under one subscription.
Vectis Mail's Pro tier licences per organisation, not per install. Run separate Vectis Mail instances for every client you operate, every geo you deploy into, every environment you stage, all under one $29 USD/month Pro subscription. Per-client DKIM, per-client branding, per-domain analytics, programmatic provisioning. The agency economics work the way you'd hope.
The agency-specific case
Six things agencies running mail infrastructure consistently need. Each maps to a specific Vectis Mail capability.
1. One subscription, unlimited installs
Pro is licensed per organisation at $29 USD/month, not per install. Spin up a separate Vectis Mail instance per client (or per geo, per tier, per environment) without paying again. Compare to managed providers where every client domain is a new line item.
2. Per-client branding
Pro Custom Branding sets a per-install product name, accent colour, and logo on the admin dashboard — the "powered by your agency" angle on the admin UI, without a platform layer to maintain. (Per-client webmail white-labelling is on the Phase 4 roadmap.)
3. Per-client DKIM + deliverability
Each client domain gets its own DKIM key, its own DNS record set, its own deliverability reputation. A bad day for one client doesn't poison another. Per-domain analytics dashboard surfaces delivery rates, bounce rates, and IP warmup state.
4. Programmatic client provisioning
40+ REST API endpoints cover domain creation, mailbox provisioning, alias setup, key rotation. Your onboarding flow can spin up a new client's full email stack (domain, DKIM, mailboxes, API keys) in seconds via API calls.
5. Per-client analytics for transparency
Surface deliverability metrics to each client via your own admin UI by querying the per-domain analytics API. They see "your domain's bounce rate" without ever seeing the underlying provider. Useful for SLA reporting + client confidence.
6. Clean exit if a client leaves
No vendor lock-in to manage. Standard Postgres + maildir formats mean exporting a client's data is a one-command operation. They can move to their own Vectis install or any standard IMAP server. Honest exit terms — sometimes the strongest retention tool.
The agency math
What it costs to run mail for 10 client domains across different providers.
| 10 client domains, ~50K emails/mo each | Vectis Mail Pro + 1 VPS | SendGrid 10 × Essentials | Postmark 10 × Pro accounts |
|---|---|---|---|
| Per-client mailboxes (Google Workspace ~$6/seat × 5 seats × 10 clients) | Included | $300/mo (external) | $300/mo (external) |
| Transactional sending (10 × 50K = 500K emails/mo) | $49 flat | ~$200 (10 × $20) | ~$1,800 (10 × $180) |
| Inbound parse / webhooks | Included | Included | Included |
| Per-client analytics + admin | Included | Per-account dashboards | Per-account dashboards |
| Total monthly cost | $49 | ~$500 | ~$2,100 |
Provider pricing per twilio.com/en-us/products/email-api/pricing + postmarkapp.com/pricing + standard Google Workspace pricing retrieved 2026-05-13. Numbers assume mid-tier plans typical for an agency setup. Mailbox hosting cost on managed providers is real. SendGrid and Postmark don't host mailboxes, so you're paying Workspace/M365 alongside.
How agencies actually deploy Vectis Mail
Two common shapes. Pick the one that matches your client mix.
Shape 1: One install, many client domains
Single Vectis Mail install, multi-domain. Each client domain has its own DKIM key, DNS records, mailboxes, and per-domain analytics. Best for: smaller agencies, clients with similar scale, no data-residency conflicts between clients. Lowest operational overhead: one server to patch, one set of backups, one update window. Most agencies start here.
Shape 2: One install per client (or per cohort)
Separate Vectis Mail install per client, or per cohort (e.g. one per geo, one per industry vertical, one per commercial tier). Best for: clients with data-residency requirements pulling them into different regions, clients requiring dedicated IPs for deliverability isolation, clients with strict change-management windows that conflict with your standard maintenance schedule. The Pro subscription covers all of them under one licence.
Mixed shape
Most growing agencies end up with both. Small clients land on the shared install; larger clients with specific requirements get their own install. The Pro licence policy means moving a client from shared → dedicated is purely an operational decision, not a budget one.
Where Vectis Mail isn't the right fit for agencies (yet)
What's not in the box. Factor in if any is critical.
White-label admin UI
Pro Custom Branding covers the admin dashboard — product name, accent colour, and logo. The webmail uses the standard Vectis skin, and a fully white-labelled admin UI on the client's own domain isn't shipped today; both are on the Phase 4 roadmap. If your clients can never see the "Vectis Mail" name anywhere in their experience, that's a real gap today.
Multi-tenant single-install isolation guarantees
Per-domain isolation is structural. Cross-tenant hardening (the strict guarantees you'd want before running competing brands on the same install) lands with Phase 4 Enterprise tier. Until then, dedicated installs are the safe answer for security-sensitive client pairs.
Centralised dashboard across installs
Per-install dashboards are built in. A single agency-wide dashboard that aggregates metrics across all your client installs is a Phase 4+ ask. For now, you'd build this externally by hitting each install's analytics API and aggregating in your own tool.
Client-facing billing portal
Vectis Mail bills you, not your clients. If you want each client to see "Vectis Mail powered by [your agency]" with a self-service billing portal in their name, you're building that layer yourself today. Some agencies use the Vectis Mail API to surface usage in their own client portal; that pattern works well.
Frequently asked questions
Does one Pro subscription really cover unlimited client installs?
Yes, within reason and as long as your organisation operates them. The Pro tier is licensed at $29 USD per tenant per month, where a tenant is your organisation. Every Vectis Mail install your organisation runs (one per client, one per geo, one per environment, your call) uses the same licence. The policy is built specifically for agencies and SaaS operators who'd otherwise pay per-instance fees with managed providers.
How do I give each client their own branded webmail?
Today, Custom Branding (Pro) brands the admin dashboard — a per-install product name, accent colour, and logo. The webmail uses the standard Vectis skin; per-client webmail and admin-UI white-labelling (custom domain, custom skin) is on the Phase 4 roadmap. Each client still runs on its own isolated install, so domains, DKIM, and analytics stay separate. See features.
Can I provision new client mailboxes programmatically?
Yes. 40+ REST API endpoints cover domain creation, DKIM key generation, mailbox provisioning, alias setup, API key management, and analytics. Your client-signup flow can call the Vectis Mail API to spin up a fresh sending domain + mailbox set in seconds. See the API Reference.
How do I bill clients for their email usage?
Your call. Vectis Mail provides per-domain analytics (send volume, delivery rate, bounce rate, complaint rate) via the analytics API. You can query that data per-client and turn it into invoice line items, dashboard metrics, or usage tiers, whatever fits your commercial model. Vectis Mail's flat pricing means your costs are predictable regardless of which model you choose.
What happens if a client wants to leave with their data?
Clean exit by design. The data is in your Postgres + maildir, both standard formats. Export the maildir tree, hand over the DNS records, transfer DKIM keys, decommission the client domain on your install. The client can re-import the maildir on their own Vectis Mail install (or any standard IMAP server) with imapsync. No vendor lock-in to manage.
Do I need separate Vectis installs per client, or can one install host many?
One install can host many client domains. Vectis Mail is multi-tenant from the database up with per-domain isolation. You'd want separate installs when: (1) clients have data-residency requirements pulling them into different geographic regions, (2) clients require dedicated IPs for deliverability isolation, (3) you're segmenting clients into different commercial tiers with different SLAs. Most agencies start with one install and add more only when these constraints kick in.
Try Vectis Mail for your agency
One Pro subscription, unlimited installs. Spin up your first client on Starter free.