FAQ

SMTP Relay Service for Business Email, Apps, and Servers

Send outbound email reliably when your app, mail server, ISP, or hosting provider limits SMTP. DNSExit SMTP Relay helps you bypass port 25 blocks, improve inbox delivery, and send from authenticated domains — starting free.

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25+ Years of service
300+ Relay servers
FREE Plan available
No credit card to start 30-day money-back guarantee Port 25 block workaround SPF & DKIM support STARTTLS encryption Instant account creation

Reliable outbound SMTP without running your own relay infrastructure

Point your mail client, server, application, or device to relay.dnsexit.com, authenticate, and start sending through DNSExit.

Simple SMTP Integration

Just set your outgoing SMTP to relay.dnsexit.com with your relay credentials. Works with Outlook, Thunderbird, Exchange, Postfix, Sendmail, and any SMTP-capable device.

Secure Authenticated Sending

Send through authenticated SMTP with STARTTLS encryption, so credentials and message traffic are protected in transit.

Start for Free

No credit card required. Start sending immediately on the free plan. Upgrade to a paid tier only when your sending volume grows beyond the free limit.

SPF & DKIM Support

Improve delivery by authorizing DNSExit in SPF and enabling DKIM signing for domains that send through your relay account.

Unlimited Sub-Users

Create unlimited relay sub-users under your account, each with their own login and sending limit. Ideal for MSPs, agencies, or resellers managing clients.

Email Tracing & Reporting

Every email sent through the relay is logged. Search by sender, recipient, date, sending IP, or domain. Click Show Delivery Status to confirm delivery instantly.

Use SMTP Relay when direct sending is unreliable

DNSExit Mail Relay is useful anywhere email needs to leave your network or application reliably.

Exchange & Mail ServersUse DNSExit as a smart host for Microsoft Exchange, MDaemon, Postfix, Sendmail, and other in-house mail servers.
Web ApplicationsSend transactional email for websites, SaaS apps, CRMs, billing systems, and automated notifications.
Office DevicesOutgoing SMTP for fax machines, copiers, printers, scanners, and VoIP phone systems that send email alerts.
Email ClientsUse as the outgoing SMTP server in Outlook, Thunderbird, Windows Mail, or any desktop email client.
Bypass ISP Port 25 BlocksSend email even when your ISP blocks outgoing port 25. We support ports 25, 26, 80, 587, 940, 2525, and 8001.
Improve Inbox DeliveryRoute mail through managed relay infrastructure when local IP reputation, reverse DNS, or authentication issues hurt delivery.

Service highlights

Built for reliability, flexibility, and scale.

SMTP ports 25, 26, 80, 587, 940, 2525, 8001
Unlimited sender email addresses
Unlimited sub-users with individual limits
Max 60 MB per message
Up to 500 recipients per message
One account, unlimited devices or locations
Whitelisted IP sending without authentication
Block specific IPs or addresses
Overage option to avoid plan interruption
Instant upgrades take effect immediately
Backup relay at relaybackup.dnsexit.com
7 layers of failover routing
1,000+ IPs across 300+ servers
100% uptime guarantee

Pricing

Based on daily email volume. Plans billed annually. Relay counters reset nightly at midnight US Eastern.

Daily Email Volume Price / Month
25 relays/day Free
150 relays/day $1.50 / month
300 relays/day $2.49 / month
450 relays/day $3.69 / month
600 relays/day $4.79 / month
900 relays/day $7.95 / month
1200 relays/day $10.95 / month
1500 relays/day $14.99 / month
2000 relays/day $19.99 / month
3000 relays/day $28.99 / month
4000 relays/day $38.99 / month
5000 relays/day $48.99 / month
6000 relays/day $58.99 / month
8000 relays/day $77.99 / month
10000 relays/day $94.00 / month
12000 relays/day $110.00 / month

How relays are counted: One relay = one recipient. A single message to 50 recipients counts as 50 relays. 50 separate messages to one recipient each also counts as 50 relays.

Need higher volume? Contact us for a custom quote.

Extra $1.25/month per IP for IP-based relay (no authentication required).

30-day money-back guarantee on all paid plans.

Start Free Sign Up with Full Access

Setup guides

Step-by-step instructions for common mail clients, servers, and SMTP gateway setups.

Email Clients

Mail Servers

Need help with SMTP relay setup?

Quick answers for ports, authentication, deliverability, and troubleshooting.

View Mail Relay FAQ
No Spam

Mail Relay is not for bulk marketing email. It is intended for transactional, business, and application mail only. Read our Anti-Spam Policy →

How Mail Relay works

The diagram below shows how outgoing SMTP is routed through DNSExit's relay infrastructure.

Mail Relay SMTP diagram
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