Nice, but you could make it alot more accessible with naming it something friendlier, postcardbuddy, or something and have some "cute" logo. Its quite tech geek bare metal now
AI and bots are all the rage right now. The word "buddy" is associated with all sorts of malware [0]. I'd say postcardbot is a great name, particularly as the Facebook Messenger implementation actually is a bot.
I've read and analyzed a large number of stories on IndieHackers and not a single one mentioned the name being an issue, or something they wished they had changed.
There probably are a few stories out there of companies rebranding successfully and meaningfully, but it doesn't seem to matter that much in the general case.
[0] https://duckduckgo.com/?q=buddy+malware&t=h_&ia=web