Posteo vs ImprovMX®

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Posteo compared with ImprovMX®
Detail	Posteo	ImprovMX®
What it does	Green, Secure, Ad-free Email Service	Forward Emails Easily
Stage	Established	Established
Founded	2009	2013
Based in	DE	US
Pricing model	subscription	freemium
Pricing	1 EUR per month with 4 GB storage, upgradeable. Includes email account, calendar, address book, and free support.	Free plan includes 1 domain and 25 aliases; Premium at $9/mo with up to 30 domains; Pro at $24/mo with up to 100 domains; Enterprise with custom pricing for unlimited features.
Key features	4 GB email storage, upgradeable Two-factor authentication (TOTP) Encrypted email, calendar and address book Calendar synchronization via CalDAV Address book synchronization via CardDAV PGP and S/MIME encryption Self-developed migration service Crypto mail storage for entire mailbox Anonymous payment option Multiple colors and Dark Mode	Email forwarding SMTP email sending Advanced email routing Multi-destination aliases Email logs API access Email webhooks Regex aliases
What makes it different	100% ad-free with no user tracking or data trading Powered by 100% green energy from Green Planet Energy Anonymous signup and payment without personal data collection Comprehensive encryption at the touch of a button for laypeople and professionals Self-developed encrypted migration service with no third-party involvement	Fast delivery averaging under 5 seconds per email with 99.99% SLA Strong privacy: does not read emails and does not sell data Self-funded and profitable since 2013 Generous free tier with unlimited free plan forever
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	73 no change since last check	67 no change since last check
Trust Flow (Majestic)	36	24
Citation Flow (Majestic)	50	44
Referring domains (Majestic)	3509	1500

8 details filled in for both companies.

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