A: Incoming e-mails are shown in full in the ticket, with their original formatting. Long e-mails are not cut.
The subject of an incoming e-mail becomes the title of the new ticket. A subject longer than 150 characters is cut at 150 characters.
When you reply to a ticket, the earlier messages in the conversation are included in the e-mail. If they add up to more than 5 MB, the oldest messages are left out of the e-mail. They are still in the ticket.