Yes, there are restrictions on file attachments when sending emails with freemail-de. The maximum size of attachments is 25 MB, and only certain file types are allowed, such as .jpg, .png, .pdf, .doc, .docx, .xls, .xlsx, .ppt, .pptx, .odt, .ods, .odp, .zip, .rar, .txt, .html, .eml, .msg, and .ics.