In an attempt of diminishing the number of spams sent, Brazil Internet Committee has decided to completely shut the port 25. It is an attempt to diminish Brazil’s ranking on the list of countries with the highest amount of spam sent. Currently Brazil is the 5th in this ranking.
The port will be completely shut in December of this year and replaced by the the port 587.
Original Article: http://blog.netrevenda.com/2012/11/07/email-brasil-bloqueia-porta-25/
If you have a Reddit Account, you got check this discussion about the topic: http://www.reddit.com/r/technology/comments/15hvkc/brazil_blocks_port_25_indefinitely_in_attempt_to/
Update:
After seeing a good amount of comments on Reddit and a great amount of doubts, I have searched for the original resolution and with some help of a translation tool it can help to better understand the Port 25 block.
Here is the text: http://www.cgi.br/regulamentacao/resolucao2009-001.htm
Amazon MP3 Store
December 27th, 2012 at 12:03 AM
[...] by PolanetaryForotdds [link] [...]
December 27th, 2012 at 2:34 PM
Here in Holland ( The Netherlands ) almost all port 25′s are blocked. Only on retail connection it’s open by default. I thought this was kinda standerd ?
December 27th, 2012 at 2:38 PM
By what I have understood from Brazil there they will fully block the port, regardless if is retail or users. Just like you I thought that was a standard.
December 27th, 2012 at 9:12 PM
[...] Brazil blocks port 25 [...]