Startmail vs Altospam Comparison (2025)

What are the differences between Startmail and Altospam?

Written by

Forward Email Team

Published

7/1/25

Time to read

Less than 5 minutes

We recommend Forward Email as the best alternative to Startmail.

Email Service Comparison

20 facts in comparison

Startmail	vs.	Altospam
Startmail "Private email you can trust" Website	vs.	Altospam "Antispam, Antivirus & Anti-Phishing Software" Website
$7/mo	Pricing	Requires you to talk to a sales team
20 GB	Storage	Requires 3rd party
25 MB	Attachments	Unknown
No	Open-Source	No
❌ Startmail claims to use a User Vault, but this statement has not been audited and their source code is closed-source	Sandboxed Encryption	No
No	Unlimited Domains	No
No	Unlimited Aliases	No
No	TTI	No
Yes	SMTP	❌ Requires 3rd party
Yes	IMAP	❌ Requires 3rd party
Yes	POP3	❌ Requires 3rd party
No	API	Yes
⚠️ Supported if both sender and recipient are using OpenPGP	E2EE	No
⚠️ Supports OpenPGP, but does not support WKD	OpenPGP	No
No	WKD	No

Email Service Screenshots

Closed-source

Startmail

Startmail is a closed-source email service. Their website says: Private email you can trust

Startmail is a closed-source email service.

Photo by Forward Email

Closed-source

Altospam

Altospam is a closed-source email service. Their website says: Antispam, Antivirus & Anti-Phishing Software

Altospam is a closed-source email service.

Screenshot by Forward Email

Compare Startmail with 78 email services