Mimecast Email Security vs Rspamd

Mimecast Email Security7.9Visit Rspamd7.9Visit

Mimecast Email Security #6 in Email Anti-Spam Software 7.9/10 Pricing on request · 30-day trial Free trial✓ 3 of 3 features Visit Mimecast

vs

Rspamd #7 in Email Anti-Spam Software 7.9/10 Free plan Free plan✓ 0 of 3 features Visit Rspamd

• Mimecast Email Security fits best

  Enterprises wanting mature secure email infrastructure

• Rspamd fits best

  Technical teams building programmable filtering

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Side by side

Feature	Mimecast Email Security 7.9/10 Visit ↗	Rspamd 7.9/10 Visit ↗
At a glance
Editor score	7.9	7.9
Ranking	#6 in Email Anti-Spam Software	#7 in Email Anti-Spam Software
Best for	Enterprises wanting mature secure email infrastructure	Technical teams building programmable filtering
Pricing model	Paid	Free plan + paid
Starting price	—	£100/mo
Free plan	—	✓ (best)
Free trial	30 days	—
Deployment	Cloud	Desktop, Self-hosted
Platforms	Web	Linux, macOS
Integrations	300+ integrations	11 integrations
Features Mimecast Email Security 3/3 · Rspamd 0/3
Phishing detection	✓ (best)	Not checked yet
Malware scanning	✓ (best)	Not checked yet
Attachment scanning	✓ (best)	Not checked yet
Specs
Quarantine access	User_and_admin	Not checked yet
Supported mail platforms	Microsoft 365, Google Workspace, on-premises and hybrid email	Not checked yet
Quarantine retention	Not checked yet	Not checked yet
Deployment type	Cloud_gateway	Not checked yet
Our review
Pros	AI detection covers phishing, BEC, anomalies, malicious URLs, and attachments Supports Microsoft 365, Google Workspace, on-premises, and hybrid email Integrates with CrowdStrike, Okta, Splunk, and Microsoft Sentinel	Open-source scoring with Bayesian and machine learning classification SPF, DKIM, DMARC, phishing, antivirus, and outbound controls HTTP API, Milter, Lua rules, and broad mail-server integrations
Cons	Pricing requires contacting sales No perpetual free plan is offered Plan differences require comparing continuity, backup, and collaboration features	Requires technical administration of rules, protocols, and deployment Scale starts at £100/month for 5K mailboxes Custom configuration may be more than small teams need
Our verdict	Mimecast Email Security is a cloud-based email protection service for organizations using Microsoft 365, Google Workspace, on-premises, or hybrid email. It targets teams that need centralized controls for phishing, business email… Read the review →	Rspamd is an open-source email filtering engine for enterprises, email service providers, hosting providers, and mail-server operators. It analyzes inbound and outbound messages through statistical learning, reputation checks,… Read the review →

Strengths and trade-offs

• Mimecast Email Security — where it wins

  • AI detection covers phishing, BEC, anomalies, malicious URLs, and attachments
  • Supports Microsoft 365, Google Workspace, on-premises, and hybrid email
  • Integrates with CrowdStrike, Okta, Splunk, and Microsoft Sentinel

  Where it doesn't

  • Pricing requires contacting sales
  • No perpetual free plan is offered
  • Plan differences require comparing continuity, backup, and collaboration features

• Rspamd — where it wins

  • Open-source scoring with Bayesian and machine learning classification
  • SPF, DKIM, DMARC, phishing, antivirus, and outbound controls
  • HTTP API, Milter, Lua rules, and broad mail-server integrations

  Where it doesn't

  • Requires technical administration of rules, protocols, and deployment
  • Scale starts at £100/month for 5K mailboxes
  • Custom configuration may be more than small teams need

• Mimecast Email Security7.9/10 · Pricing on request · 30-day trial

  A broad email-security suite for organizations protecting complex mail environments.

  Visit MimecastFull verdict →
• Rspamd7.9/10 · Free plan

  A configurable gateway for teams building spam, phishing, and malware controls.

  Visit RspamdFull verdict →