All your domains.
One inbox. Zero spam.
Host unlimited professional mailboxes across every domain you own and relay transactional email through the same trusted stack - with enforced SPF, DKIM, and DMARC on every plan.
Unlimited Domains
on every plan
From $1.20
per month
9,600 emails/day
send throughput
SPF · DKIM · DMARC
enforced by default
2-Day Free Trial
included on most plans
Unlimited Domains
One account.
Every domain covered.
Most email providers charge per domain. SMTP Zen doesn't. Add as many domains as you need - clients, brands, projects - and manage every mailbox from one clean dashboard.
Add domains in seconds
Connect any domain with step-by-step DNS guidance. We walk you through SPF, DKIM, and DMARC for every one.
Catch-all routing per domain
Never miss an email. Route unmatched addresses exactly where you need them - CRM intake, shared inbox, or a single mailbox.
Mailboxes for every brand
Create multiple mailboxes per domain - one plan handles all your clients, brands, and side projects without extra fees.
Forwarders without storage
Spin up lightweight forwarders that don't count against your quota - perfect for aliases and distribution lists.
High Deliverability
Your emails land.
Not in spam.
We don't just hope your emails arrive. We enforce the standards that make them land - and give you full visibility into every message.
SPF, DKIM & DMARC - enforced
We require and guide you through the full DNS authentication stack. Your emails are cryptographically signed and verified on every send.
TLS enforced in transit
Every connection is encrypted. Insecure delivery attempts are rejected and modern ciphers are used by default - credentials stay safe.
Real-time logs & forensics
See exactly what happened to every message. Track send paths, bounces, blocks, and delivery status in real time - fix issues fast.
Multi-layer spam defence
Adaptive heuristics and reputation checks keep junk out and users safe, while ensuring legitimate mail flies through without delay.
Simple Setup
Up and running
in under 5 minutes.
No complex migrations, no hidden configuration. Three steps from sign-up to a fully deliverable inbox.
Create your account
Register in under a minute. Choose your plan, enter your domain, and you are ready to go.
Add your domains & set up DNS
Add any domain and follow our guided DNS wizard. We show you the exact SPF, DKIM, and DMARC records to set - no guessing.
Send email that lands
Create mailboxes, forwarders, and SMTP credentials. Every message is signed, encrypted, and tracked in real time.
2-day free trial · No long-term contracts · Cancel anytime
Professional Email plus production SMTP
- Security-first delivery with SSL/TLSEnforced TLS in transit, automatic SSL certificates, and sane ciphers by default - keep credentials safe and traffic locked down.
- Mailbox-Free ForwardersSpin up forwarders in seconds - no storage, no quotas, no extra mailboxes.
- Deliverability that sticksWe enforce SPF/DKIM/DMARC, so your mail reaches its final destination: your customers' inboxes.
- Real-time Email Log & ForensicsSearch, filter, and drill into every message. See send/receive path, size, bounces, blocks and more.
- Zero-Downtime IMAPSyncMigrate mailboxes live with automatic delta syncs. No weekend cutovers, no lost mail - just a clean switch when you’re ready.
- Ironclad Spam & Phishing DefenseMulti-layer filtering with adaptive heuristics and reputation checks keeps junk out and users safe, while letting the good stuff fly.
- Dead-simple, feature-rich interfaceEverything in one clean dashboard - domains, mailboxes, forwarders, logs, and billing - no maze of panels or hidden settings.
- Catch-All That’s Actually UsefulCollect misaddressed mail per domain and auto-route it to the right inboxes, with rules to tame noise.
- Crossbox Webmail, SuperchargedA fast, modern UI your team will love - keyboard shortcuts, advanced search, unified inboxes, calendar & contacts baked in.
- Pro SMTPHigh-deliverability SMTP for products at scale, unlimited domains, and priority support.$11.99/monthUsageDomain NamesUnlimitedMailboxes20BandwidthUnlimitedEmail Forwarders / Alias10Base Disk Quota20GBFeaturesBackups"Catch All" EmailsAdvanced Spam FilterSSLPriority Support
- Freelancer SMTPReliable, no fuss SMTP service for client work - custom domains, forwarding, and more.$5.99/monthUsageDomain NamesUnlimitedMailboxes10BandwidthUnlimitedEmail Forwarders / Alias10Base Disk Quota10GBFeaturesBackups"Catch All" EmailsAdvanced Spam FilterSSLPriority Support
- Starter SMTPSimple, dependable SMTP to ship transactional emails - no fuss, ready in minutes.$2.99/monthUsageDomain NamesUnlimitedMailboxes5BandwidthUnlimitedEmail Forwarders / Alias10Base Disk Quota5GBFeaturesBackups"Catch All" EmailsAdvanced Spam FilterSSLPriority Support
- Roll your ownYour plan, your rules. Tailored plan just for you. Fully customizable.$1.2/monthUsageDomain NamesUnlimitedMailboxes1BandwidthUnlimitedEmail Forwarders / Alias1Base Disk Quota2GBFeaturesBackups"Catch All" EmailsAdvanced Spam FilterSSLPriority Support
What SMTP Zen is (and isn’t)
Built for
- Product and “relationship” email: receipts, password resets, login codes, account alerts, invoices, and day-to-day team replies.
- One place to manage domains, mailboxes, forwarding, catch-all rules, and SMTP relay.
- Deliverability guardrails: enforced TLS, guided SPF/DKIM/DMARC setup, live logs, and abuse/spam filtering.
Not built for
- Cold outreach, bought/rented lists, affiliate blasts, or any email people didn’t ask for.
- High-volume marketing automation or “growth hacks” meant to dodge spam filters.
- Sending that ignores consent, rate limits, or unsubscribe rules.
Ready to get started?
Professional email for
every domain you own.
Unlimited domains. Enforced deliverability. One clean dashboard. Start your 2-day free trial today - no long-term contracts, cancel anytime.
2-day free trial · From $1.20 / month · Cancel anytime