Authenticated sending
STARTTLS on ports 25, 587 and 2525 with SPF, DKIM, and DMARC alignment for every verified domain.
01 smtp server
Cloud SMTP server with relay, hosting, and dedicated IPs.
Run transactional and bulk email on managed infrastructure — not a DIY VPS. SMTP-X combines SMTP relay, secure hosting, dedicated IP reputation, and real-time analytics in one platform.
What is an SMTP server?
An SMTP server accepts outgoing mail from your application or marketing platform and delivers it to recipient mailboxes. SMTP-X operates the servers, IP reputation, and ISP relationships — you connect with standard SMTP or our REST API.
Volume that scales
From 3,000 free emails/month to millions — add dedicated IPs as volume grows.
Built-in testing
Mail Tester, SMTP Test, and DNS tools included on every plan.
SMTP relay — send through our servers
Point any SMTP-compatible app at SMTP-X. Works with WordPress, CRMs, MailWizz, Mautic, Interspire, and custom backends — no code rewrite required.
When to use SMTP relay
- ✓ Existing software already speaks SMTP
- ✓ CMS plugins and shopping carts
- ✓ Marketing platforms with SMTP settings
- ✓ Lower integration effort
Relay + API together
Every account includes both SMTP relay and REST API — choose per workflow. High-volume products often prefer the email API for speed.
- ✓ Same dashboard and analytics
- ✓ Shared dedicated IPs and domains
- ✓ Webhooks on API sends
Managed SMTP hosting — no server maintenance
Self-hosted SMTP on a VPS means patching, blacklists, and reverse DNS yourself. SMTP-X hosting includes monitored IPs, bounce handling, complaint feedback loops, and 99.9% uptime — without you running Postfix or Exim.
Self-hosted vs SMTP-X hosting
VPS SMTP often gets blocked on port 25 and lacks warmed IPs. Our hosted relay uses pre-warmed dedicated IPs, live reputation monitoring, and support that helps with DNS and warm-up.
Multiple domains on one IP
Add unlimited sending domains to a dedicated IP at no extra cost — ideal for agencies and multi-brand senders. See multiple domain setup.
Compare SMTP server plans
We accept cryptocurrency (USDT, USDC, BTC, ETH and more).
Guide to buying an SMTP server
Merged from our buying guide — what to evaluate before choosing shared vs dedicated infrastructure.
Shared vs dedicated IP
Shared suits low volume (our free plan: 3,000 emails/month). Dedicated isolates reputation — from €39/month for 100,000 emails and one IP. See dedicated IPs.
Features to require
SPF/DKIM/DMARC support, bounce analytics, API + SMTP, spam testing, and chat support. All included on SMTP-X paid plans per pricing.
Reliability and scale
Target 99.9% uptime and monthly limits without daily caps. Add dedicated IPs as volume grows — no server migrations.
Support when it matters
Free setup help Mon–Fri 07:30–16:30 GMT+2. Contact sales for unlimited custom contracts.
Start your SMTP server in minutes.
Free tier for testing · €39/month for 100,000 emails with one dedicated IP · Setup help included.
We accept cryptocurrency (USDT, USDC, BTC, ETH and more).