My guess is FOIA.
The
San Antonio Lightning has always been a great outlet for local investigations. They always seem to get another side of a story and usually posts any related do ents fairly quickly. If it's not FOIA (Open Records Act, but who's counting?), then they've got somebody on the inside who helps them out when it comes to city do ents.
And just for others to know, e-mails to/from a city employee's computer are more times than not, public record (usually those with regards to security and such aren't).