Still having problems
I already had restarted the server, and the problem was the same. Only when I had changed this port it started to work.
Now I got other problems, looking at the server log, suddenly I got many errors from memailfilter.exe until mail and http server stops to work anymore, then I must restart. I think that after upgrading mailenable you must do some arragements on it's configuration so it can works well with Plesk, related to Spamassasin.
All this problems started when I had upgraded to 7.5.4!!! Before that I was happy! Just after this upgrade the server started to have DNS problems and also mail problems. So I decided to upgrade mailenable, then the control panel and webmail didn't worked. Now I get this error:
client 217.126.110.29#1638: update 'domain.com/IN' denied
this IP doesn't belongs to me, but the domain yes.
I'm just going crazy!!