[x0x0]

Is this viral like the gpl? Does the use of the inbox backend, hosted by me, require release of the full source to the entire app that uses the inbox backend? My brief reading of the agpl seems to say yes. Which makes this an interesting toy but nothing more...

[icebraining]

Yes, the AGPL does require the release of the source of any code built on components licensed under it. Chances are they'll have a commercial license, though my salary disputes your assertion that an AGPL base can only be used as a toy - we have contracts with some of the largest companies in my country.