Mail-in-a-Box vs Blacknight
In short: Blacknight wins on privacy, Blacknight wins on price, and Blacknight wins on features. The full comparison is below, last checked 25 October 2026.
Which should you choose?
- Choose Mail-in-a-Box if you want a free plan before you pay anything and open-source apps anyone can check.
| Feature | Mail-in-a-Box | Blacknight |
|---|---|---|
| Overall | Not rated | 3.0 |
| Privacy | Not rated | 1.5 |
| Price | Not rated | 4.0 |
| Features | Not rated | 4.5 |
| Cheapest plan | Open source Free | Titan Pro €2.50 a mailbox a month |
| Free plan | Yes, open source | No |
| Storage | Not confirmed | 10 GB |
| Your own domain | ✓ Yes | ✓ Yes |
| End-to-end encryption | No | No |
| Company based in | United States | Ireland |
| Your data is kept in | Your own server | Not confirmed |
| Founded | 2013 | Unknown |
| Free trial | Free to download | Unknown |
| Funded by advertising | No | No |
| Works in any mail app | ✓ IMAP and SMTP | ✓ IMAP and SMTP |
| Calendar and contacts | ✓ Yes | ✓ Yes |
| Aliases | Yes | Yes |
| Open-source apps | ✓ Yes | No |
| Sign up without ID | No | No |
| White label | No | Unknown |
| Reader offer | None | None |
| Last checked | 25 October 2026 | 22 October 2026 |
Want to add another? Open this in the compare tool.
The key differences
- Mail-in-a-Box's cheapest plan is Open source (Free); Blacknight's is Titan Pro (€2.50 a mailbox a month).
- Mail-in-a-Box has a free plan (open source); Blacknight has no free plan.
- Space: Mail-in-a-Box gives storage not confirmed, Blacknight 10 GB of storage.
- Your mail is stored in Your own server with Mail-in-a-Box, and in Not confirmed with Blacknight.
- The companies sit under different laws: Mail-in-a-Box in United States, Blacknight in Ireland.
Mail-in-a-Box and Blacknight: your questions
Can I use my own domain with Mail-in-a-Box or Blacknight?
Yes, both do. Mail-in-a-Box: Yes. Blacknight: Yes.
Where is my email stored with Mail-in-a-Box and Blacknight?
Mail-in-a-Box keeps it in Your own server. Blacknight keeps it in Not confirmed.
Price changes and news
Neither price has changed since my first check on 22 October 2026.
The latest headlines: Mail-in-a-Box news · Blacknight news.
Not sold on either? Try these
- mailbox.org4.5 out of 5 overall
- Proton Mail for Business4.0 out of 5 overall
- Tuta Business4.0 out of 5 overall
Mail-in-a-Box vs mailbox.org · Blacknight vs mailbox.org · Mail-in-a-Box vs Proton Mail for Business · Blacknight vs Proton Mail for Business · Mail-in-a-Box vs Tuta Business · Blacknight vs Tuta Business
How to switch
Moving between any two providers works the same way. Pick your two providers for the steps.