unfolding header lines in TIdAttachment[File]

[Boba TC]

First of all, thanks to you guys for having this forum running!
I did try to post on embarcodero but it seems to be cold dead.
My problem is in sending an attachment with TIdSMTP v.10:

Code:

TIdMsg *IdMsg;
//...
TIdAttachmentFile *attchmnt=new TIdAttachment(IdMsg->MessageParts, "filename.txt");
attchmnt->FoldLines=false; - ?
attchmnt->UnfoldLines=true; - ?
IdMsg->Send();

this message does arrive to its intended destination with proper attachment, but the receiving server wants
the attachment header lines to be unfolded and header fields to be  separated by "; " (semicolon followed
by a space). So, where do I go to satisfy this server? Thanks in advance. Boba TC.