Hi Lucas,

I suppose that same issue does NOT happen into development environment... right?

Few hints questions:
1)  Is attached file readable?
2) Is attached filename containing spaces?
3) Is attached file very large?

Regards,
Gianni

Hi,

Exactly, the development environment works normally.

1)  Is attached file readable?

   Yes, all tested files are readable. They were tested during development and worked normally.

2) Is attached filename containing spaces?

  Some files yes, others no.

3) Is attached file very large?

   A maximum of 1 MB

Are you running in a CS environment where the services are running something like

[SERVICES_EXEC]
*.*=$PATH:*.*

If so, try putting UPOPMAIL=UPOPMAIL above this line, so the upopmail is run 'local'. 
Uniface dlls will try and run as remote services under these circumstances, and it is one of the things which tends to change between devel and production (whether the CS is on or off...)

Iain