What is SMTPServer?
SMTPServer is a cloud-based SMTP relay service. We handle infrastructure scaling, ISP outreach, IP reputation monitoring, and real-time analytics so you can focus on sending email from your application.
Frequently asked questions about SMTPServer.
Setup, API, webhooks, billing, deliverability, and troubleshooting — organized by topic. Need more help? Visit the help center or contact support.
Dashboard & getting started
How does SMTPServer work?
After signing up, add your domain in the dashboard and configure dedicated IPs. We provide DNS records for authentication. Once verified, your SMTP credentials are ready for sending.
How many emails can I send per month?
With one dedicated IP you can send up to 100,000 emails per month. Add more dedicated IPs to scale volume. Follow the recommended IP warm-up process for best deliverability.
I made a purchase — what should I do next?
Add your domain and configure the DNS records shown in the dashboard. After verification completes, your SMTP server configuration is activated and credentials appear under SMTP settings.
API & SMTP credentials
How do I find my SMTP credentials?
Open your dashboard → SMTP settings. Hostname, port, username, and password are listed there after domain verification.
How do I connect the API to my application?
SMTPServer provides a RESTful API for sending email, managing recipients, and retrieving logs. See our API integration guide for authentication, request formats, and code examples.
Do I need to purchase the Email API separately?
No. SMTP and API access are included in every plan at no extra cost. Rate limits depend on your plan tier.
Can I integrate SMTPServer with my application?
Yes. Any application or library that supports SMTP can use SMTPServer. Configure the credentials from your dashboard or use the REST API.
Does SMTPServer support REST API integrations?
Yes. Send email programmatically via our REST API with webhooks for delivery events. Full details are in the API integration page.
Webhooks
What are SMTPServer webhooks?
Webhooks send real-time HTTP notifications to your application when email events occur — delivery, opens, bounces, or spam complaints.
How do I configure webhooks?
Add a secure HTTPS endpoint URL in the dashboard. SMTPServer posts event payloads to that URL as events happen.
Deliverability & mail tester
How can I improve email deliverability?
Authenticate with SPF, DKIM, and DMARC; warm up new IPs gradually; keep lists clean; avoid spam-triggering content; and use our Mail Tester before large sends.
What is IP warm-up and why is it important?
IP warm-up means gradually increasing send volume from a new IP so mailbox providers build trust in your sender reputation. Warm-up guidance is emailed with your SMTP credentials.
Integrations & platforms
Can I use SMTPServer with marketing software?
Yes. SMTPServer works with email marketing platforms, CRM systems, and custom apps that support SMTP — including Interspire, MailWizz, and Mautic.
Which platforms work with SMTPServer?
Any SMTP-compatible platform: Interspire, MailWizz, Mautic, custom applications, CRM systems, and SaaS platforms. If it supports SMTP, it works with SMTPServer.
What email marketing platforms do you recommend?
Many customers use Interspire, MailWizz, and Mautic, but SMTPServer is not limited to any single platform — use whatever supports SMTP integration.
Billing & plans
What are the pricing plans?
Paid plans start at €39 per month for 100,000 emails and one dedicated IP. See the full volume table on our plans page.
Do you offer a free plan?
Yes. New accounts get a free plan with up to 3,000 emails per month (100 per day) on a shared IP after domain verification. No credit card required.
What payment methods do you accept?
Credit and debit cards, cryptocurrencies, and PayPal. Plans bill monthly on a 30-day cycle.
Do I need to sign a contract?
No long-term contracts. All plans are month-to-month — upgrade, downgrade, or cancel anytime.
Errors & troubleshooting
Why are my emails going to spam?
Common causes: missing SPF/DKIM/DMARC, poor IP reputation, spam-triggering content, or high bounce rates. Run the Mail Tester and verify DNS records in the dashboard.
Why is my domain verification failing?
Check for incorrect DNS records, propagation delays (up to 48 hours), or SPF/DKIM syntax errors. Compare your registrar entries against the exact values in the dashboard.
Why am I getting SMTP authentication errors?
Verify SMTP hostname, port (587 or 465), username, password, and SSL/TLS settings match the credentials shown in your dashboard SMTP settings.
SMTP server setup guide
Step-by-step answers for configuring your SMTP server — merged from our setup guide. For API-specific steps see installation instructions.
Which SMTP ports should I use?
Port 587 with STARTTLS is recommended for most applications. Port 465 with implicit SSL/TLS works for legacy clients. Avoid port 25 for client submission.
What DNS records does SMTPServer require?
SPF, DKIM, and optional DMARC TXT records plus a tracking CNAME. Exact values appear in your dashboard after adding a domain — see multiple domain setup.
How long does domain verification take?
Usually minutes, but DNS propagation can take up to 48 hours. Use our DNS Lookup and MX Lookup tools to confirm records are live.
Can I test SMTP before going live?
Yes. Use the free plan, run the SMTP Test tool to verify connection and auth, then send a test message through the Mail Tester.
Still have questions?
Browse the help center or reach our support team directly.