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