I'm currently working at Ta Mère SCRL a small development shop in Belgium.
We mainly do mobile apps (iOS, Android) for clients. We also have a strong interest in Pharo Smalltalk and Rust.
You can load it from SqueakSource 3:
Gofer it url: 'http://ss3.gemstone.com/ss/postmark'; package: 'ConfigurationOfPostMark'; load. (Smalltalk at: #ConfigurationOfPostMark) project stableVersion load.
And you can use it like:
| email interface | email := PMEmail new from: 'email@example.com'; to: 'firstname.lastname@example.org'; subject: 'Test Application'; textBody: 'Yeah baby'; yourself. interface := PMInterface new. interface apiKey: 'blopblop'. interface send: email.
The implementation is really basic and does not handle attachments at the moment. I use it on a staging application that will probably be in production in January. I will see how it behaves under small load and improve it if needed.
edit: you can now attach files to your emails !