Hide quoted history in guest email replies

Description: When a guest replies to an email conversation, their email client adds every earlier message in the thread below their reply. Sparrow Intel shows that whole chain inside each message, so each reply repeats the full back-and-forth, nested one level deeper every time. Staff have to read past pages of old messages to find what the guest just wrote, and it is hard to tell new text from old.

Requested behavior

• Each email in a conversation shows only the new text the sender wrote.

• The earlier history is collapsed behind a Show quoted text control under the message, so staff can still expand it when they need it.

• Signatures and attachments the sender added in their new reply stay visible.

• This applies to emails already in the inbox, not only new ones.

• Replies sent from Sparrow Intel still include the previous message for the guest, the way standard email does.

Current workaround The guest's new text is at the top of each email, above the first "On [date], [name] wrote:" line. Everything below that line is earlier conversation already shown further up the thread.