ImprovMX

Overview

Founded in 2016 and headquartered in the Netherlands, ImprovMX is a lightweight email forwarding service specialized in the Email Service space. Its core capability is automatically forwarding emails sent to your custom domain ([email protected]) to your existing mailbox (Gmail, Outlook, etc.), eliminating the need to run your own mail server. The free plan supports unlimited alias forwarding and Catch-All capture for a single domain, making it popular among indie developers, freelancers, and site owners.

As of 2026, ImprovMX serves millions of domains worldwide. Its unique positioning is "forward only, no storage" — users keep their existing email habits while gaining a professional custom domain address with just a few DNS records. Pro and Business plans add multi-domain management, SMTP relay, and advanced routing rules.

Key Strengths

• Forever Free Forwarding: One domain, unlimited aliases, completely free. Perfect for personal blogs and side projects. No server, no software — just 5 minutes of DNS configuration.
• Catch-All Capture: Automatically receives emails sent to any address under your domain. Extremely useful for domain email management, especially for tracking email sources during service registrations.
• Fast Setup Experience: A comprehensive DNS setup wizard covers all major DNS providers (Cloudflare, Namecheap, GoDaddy, etc.) with step-by-step MX, TXT, and CNAME record instructions. Non-technical users can complete setup independently.
• SMTP Relay Capability: The Business plan includes SMTP relay for outbound sending through your own domain. Combined with SPF/DKIM configuration for Email Service, it significantly improves sender reputation.
• Developer-Friendly API: RESTful API for alias creation, deletion, and DNS status checks. Ideal for automated email routing management in Backend Integration workflows.

Product Ecosystem

Domain Email Forwarding

ImprovMX's core feature forwards custom domain emails to your existing inbox. Supports multiple aliases (info@, contact@, hello@ pointing to the same inbox) or different inboxes per alias. All forwarded emails retain original sender information, and replies can use your custom domain via SMTP relay.

Catch-All Capture

When enabled, emails sent to any non-existent address under your domain are captured and forwarded to your designated inbox. Useful for assigning unique addresses per service during registrations, but also attracts spam — use with caution and proper filtering.

SMTP Relay

The Business plan includes SMTP relay for outbound sending through your custom domain. Combined with SPF, DKIM, and DMARC records, it ensures sender reputation and prevents your emails from landing in spam folders. This is critical for email deliverability optimization.

Limitations

• Forwarding Only, No Storage: ImprovMX does not provide mailbox storage, a web interface, or IMAP/POP3 access. Users must pair it with an existing email service. For an all-in-one solution, consider Soverin.
• Single Domain on Free Plan: The free plan supports only one domain. Managing multiple domains requires upgrading to Pro ($3/month/domain) or Business ($5/month/domain).
• Premium Features Paywalled: DNS checks, multi-domain management, SMTP relay, and API access all require paid plans. Free users cannot send outbound emails.
• Catch-All Spam Risk: Enabling Catch-All significantly increases spam volume since every address under your domain is accepted. Additional filtering rules are recommended.

Use Cases

• Personal Domain Email (★★★★★): The free plan perfectly solves personal blog and portfolio email needs with 5-minute setup.
• Startup Temporary Email (★★★★☆): Quickly set up contact@, support@ for new projects without mail server investment.
• Multi-Project Management (★★★☆☆): Pro plan needed for multiple domains, suitable for teams managing several domain strategies.
• Lightweight Outbound Relay (★★★☆☆): Business plan SMTP relay for custom domain outbound sending in low-volume scenarios.
• Enterprise All-In-One Email (★★☆☆☆): For full email features (calendar, contacts, storage), consider professional email services.

Pricing

Note: All plans are billed per domain. Business plan SMTP relay is limited to 500 outbound emails per day.

FAQ

• How is ImprovMX different from traditional email services? ImprovMX handles forwarding (inbound) and SMTP relay (outbound) only. It does not provide mailbox storage, a web client, or IMAP/POP3 access. Users must pair it with an existing email provider. See email service provider comparison.

• What are the free plan limitations? The free plan supports one domain with unlimited aliases. Managing additional domains requires Pro ($3/month/domain) or Business ($5/month/domain). See business email service guide.

• Does Catch-All attract spam? Yes. Enabling Catch-All forwards all emails including spam. Use with email provider filtering rules or enable only for specific use cases. See email deliverability optimization.

• How to configure ImprovMX on Cloudflare? Add the MX records and TXT verification records provided by ImprovMX's setup wizard to your Cloudflare DNS settings. The wizard includes detailed Cloudflare-specific instructions. See SPF/DKIM/DMARC setup guide.

• What is the SMTP relay daily limit? The Business plan allows 500 outbound emails per day. For higher volumes, consider a dedicated SMTP relay service. See SMTP configuration guide.