EMail Task Problem

I have a pretty simple process that copies some files from an AS400 to a directory on the same server where my sql 2005 instance lives. I then use an email task to send these files to a client.

However, the email task does not work. I get the following message:

[Send Mail Task] Error: Either the file "BYNSOSR1;BYNSOSR2;BYNSOSR3;BYNSOSR4;BYNSOSR5;BYNSOSR6;BYNSOSR7" does not exist or you do not have permissions to access the file.

Well, the files definitely exist where they are supposed to be so I guess it's a permissions error. However, I have no clue which user would need permissions on that directory. As a test, I gave everyone read permissions and still got this error.

Any suggestions about which user I need to allow read access to the directory where these files exist

Thanks in advance for any info.