ProtonMail is a full email inbox service with hosted mailboxes, storage, calendar, contacts, web and mobile apps.
ImprovMX offers advanced[1] email forwarding to your existing mailbox (i.e. Gmail).
Your choice largely depends on if you need a hosted inbox or prefer to use your existing inbox.
ImprovMX
Proton Mail
Pricing
Full custom domain free plan.
Light plan with SMTP sending.
Better scaling with many domains & aliases.
Light plan with SMTP sending.
Better scaling with many domains & aliases.
Branded Free account, paid custom domains.
Email Forwarding
Email forwarding with advanced features.[1]
Forwards messages with simple rules and conditions.
SMTP Sending
Supports SMTP sending.
Supports SMTP sending.
Hosted Mailbox
No mailbox, we forward to your existing inbox.
Full mailbox with inbox, folders, and email storage.
Apps & Ecosystem
No suite of apps, just email forwarding.
Full ecosystem with web, mobile, and desktop apps.
Scalability/Limits
Scales well with transparent limits. Talk to us for uncapped limits.
Scales well for teams and organizations via Proton for Business.
Logging/Analytics
Only basic security events logged.
CLI/MCP
Does not offer a CLI nor MCP.
Compliance
ImprovMX is GDPR compliant.
GDPR, SOC 2 Type II and ISO 27001 compliant.
1. We offer rules routing, wildcard addresses, multiple recipient destinations, regex aliases and webhooks.
2. ImprovMX's CLI is built for terminal workflows, automation, and ai coding tools like Claude Code and OpenAI Codex.
Questions? Reach out to us, we love chatting about email service providers.
Your domain deserves better email
Set up in minutes and forget about it.