For most AARP emails...
If you can enter domain ---> @email.aarp.org @aarp.org
For some Redeem for Gift Cards ----> @aarprewards.aarp.org
(This seems to be an older domain that is phasing out; but may be recycled by AARP in the future. ๐ค ; otherwise @email.aarp.org @aarp.org are the principles to keep)
Almost forgot that if you 'win an Instant Win or Sweepstakes' it is run from an outside third party = different email domain. I checked my winning emails and it is different. So you should also enter:
@helloworldfulfillment.com for Instant Winners
@e.helloworldemail.com for Sweepstakes Winners
@m.helloworldemail.com
I usually get mine in the 'junk'/ spam mail box- which is my general pseudo-inbox. I never white listed AARP; but still get all the emails I should get from them; Daily, Weekly Web Letters, Instant Wins/ Sweeps, notifications, etc. All works out well.
๐ The Box Tops - The Letter (Upbeat 1967) - YouTube