I would ignore this. It is a filler sentence, people use it when it doesn't seem quite polite to just launch in to the real topic they're contacting you about. Also, they are not asking 'how are you?' as an actual question.
I would only respond if you need a filler sentence too or if there is a relevant health issue, which you would have possibly mentioned anyway whether they mentioned you being well or not.
That is all if it is a work related or formal email. If it is a friend then you could respond if you want.
UK based wavy
Mostly waves, but curls and straight bits too!
Fine to medium, high porosity, medium density, very low elasticity
Highlights damage (growing it out), seems to like protein and need lots of moisture.
Cleanse - CJDF, trying out low poos ; Co wash- Uk chemist brands, Urtekram Rose or Aloe, Hairveda Amala Cream Rinse; RO - varies, Tigi Moisture Maniac, Desert Essence Coconut ; Leave in - Keracare natural textures; Sealant - argan oil
Trying out new things, still looking.