How to quickly answer email with an audio note

Sometimes I need to give very long answers to some emails and I am very bad at typing, so if I know that person and I have her/his phone number, I send her an audio note via Whatsapp. But there are many others for which I do not have their phone numbers. So I would like to send them, via email and using Thunderbird, in the easiest and quickest possible way, an audio note. I found that in Mac, I can record an audio note, then put in on my dropbox public folder, then copy the shared URL, and then past it into the email, but this is a bit long. Can you suggest a more practical way?

Options:

1. Use the dictation (voice to text) within Mac OS X
2. Use the voice memos app to record in Mac OS X, then hit share or drag & drop recording to Thunderbird
3. If your Max OS X has Siri (voice assistant) I guess you can ask her Hey Siri record a voice memo or Hey Siri Open Voice Memos. Or if you default email app IS thunderbird maybe she can dictate (voice to text) to your email: Hey Siri send email to [name] about [subject] and say [message]

Might get better answers on the Apple Stack Exchange site if that is the OS you want assistance on. OS X has an Automator app that is supposed to help with things like this.