How can I automatically forward copies of all incoming text messages to my computer email?

Like I have read..........seems that when accounts were set up initially on my 5, AIM was the type of messaging service everyone used......tomorrow that is gone........Now my accounts on my laptop are set up with "Messages", but when I tried to add a new account w/o using AIM, on my phone, the dialog box gave me 3 choices........AIM, Jabber, and Yahoo!!!!

Sounds real easy.......I have 4 different accounts, all with different Apple IDs.........do I disable all but one.......

worked on my 6sPlus when phone was off.......now it won't...and I set up from a backup so 8Plus is a mirror of older phone....

In accounts.....they all say AIM

See the instructions in this article:

Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

How did you get it setup to forward messages to your laptop?