Retarus

Cloud email security, transactional mail, fax, SMS, EDI and e-invoicing

Munich, Germany · Founded 1992 · Paid
A European alternative to Proofpoint Mimecast Barracuda Avanan / Check Point Harmony Email

About Retarus

Retarus is an owner-managed German cloud-messaging company founded in 1992 and headquartered in Munich at Aschauer Straße 30, with around 500 employees across 20 offices on four continents. Its Enterprise Cloud platform covers email security, transactional and bulk email, fax-as-a-service, SMS, EDI and e-invoicing for large organisations, with messages routed through certified European data centres. Pricing is enterprise/quote-based and contracts are typically annual.

Quick facts

Pricing model Paid
Free trial
Open source
Self-hostable No
Public API No
Target audience B2B
Company size fit All
DPA available Yes
Data stored in EU Yes
Last verified by eubuilt.eu on 26 Apr 2026 — re-checks every 6 months Flag listing → Read our criteria →