N‑able Mail Assure vs Postmark Comparison (2025)

What are the differences between N‑able Mail Assure and Postmark?

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 N‑able Mail Assure.

Email Service Comparison

20 facts in comparison

N‑able Mail Assure	vs.	Postmark
N‑able Mail Assure "Email protection to help you secure and scale" Website	vs.	Postmark "The email delivery service that people actually like" Website
Requires you to talk to a sales team	Pricing	$15/mo
Requires 3rd party	Storage	No Postmark does not support storage
Depends on inbound/outbound (e.g. 10 MB)	Attachments	10 MB
No	Open-Source	No
No	Sandboxed Encryption	No
No	Unlimited Domains	No
No	Unlimited Aliases	No
No	TTI	TTI
❌ Requires 3rd party	SMTP	Yes
❌ Requires 3rd party	IMAP	No
❌ Requires 3rd party	POP3	No
Yes	API	Yes
No	E2EE	No
No	OpenPGP	No
No	WKD	No