strange compile error (?)

Hi all!

At the beginning i will say, that my english is not very good. I am new on forum and i have stupid mistake. I wrote a small project - smtp client. I use Qt Creator and when i compiles my program, he runs and everything is OK (e-mail reach the sender), but when i copy dll files to folder with my application(exe file) and run my application with "system-level" e-maile don't reach the sender :( This is a movie with my problem: http://www.youtube.com/watch?v=XlkLI...ature=youtu.be

Does the app work fine in qt creator in both release and debug mode?

Try Dependency Walker and see if any library you rely on is missing.

Another thing that may be the cause is windows firewall, try disabling it and see if that helps.