Fetch command response questions

Hello,

I have the following issue:

When using command 

FETCH 2 (BODY.PEEK[HEADER] UID INTERNALDATE FLAGS BODYSTRUCTURE)

on 2 different emails, we get 2 different response structure.

First response structure contains the BODYSTRUCTURE in a single line, while in the second response, the BODYSTRUCTURE is divided into multiple lines with "{61}" character at the end of each line.

The difference between those 2 emails is the name of some attachments. The attachment is an .eml file named "Re: [SR-Users] Keep-Alive in dialog "freeing a free fragment""

Is this a sort of bug or is it correct to receive the BODYSTRUCTURE on multiple lines?

Vlad Pop