Yes, although it requires that the list be configured by its administrator(s) to allow attachments. If your post contains text about the attachment being removed, the list doesn’t allow them. Note:
FreeLists virus-scans all email traffic, discarding any mail that contains a virus. So if your attachment-containing post never arrives, please consider that it might’ve contained a virus.
The maximum message size is 5MB. If your post exceeds this, you’ll be emailed back an error message.