Have a look on my website, there's information there on errors. I think this may be caused by MSMAPI32.OCX not being registered, in which case you need to include it with your distribution setup.

>Dear Nigel,
>
>I am using your mail class. In development computer, everything is ok! I create a EXE and distribute to another computer but an error message prompted "Error code is 1426". Could you tell me what is this error code and do you have a list of error code? I have already registered the necessary DLL and OCX file and setup the same e-mail client. Thanks for your help!
>
>Best Regards,
>
>Justy Chow