SSIS Send Mail Task Problem

Hi,

I have got the problem connected with Send Mail Task in SSIS.
The general idea was: sending email alert to different email users. I tried to use Foreach Loop task which loops through dataset (where the emails are stored) and assign different email addresses to SSIS package variable.

When I try to use this task inside Foreach Loop task I receive this error message: "Error: 0xC002F304 at Send Mail Task, Send Mail Task: An error occurred with the following error message: "The parameter 'address' cannot be an empty string."

The SSIS package has variable (string) which is binded with ToLine - property of Send Mail task (it was set up in Expressions tab of Send Mail task). This ToLine property should assign different emails during every loop of Foreach Loop task.

But unfortunately is seems to be not true, because Send Mail task does not allow to assign different values to ToLine property while is in Run-Time.

Have you discovered this quite bizzare Send Mail task behaviour before ??
I appreciate every help and suggestions.

Thanks,Marek