Yesterday there was a lot of talk about Verizon moving out of email and transitioning all their customers over to the AOL backend.  The source was a page in the Verizon help center about transitioning an email address. There is no date on the page, so it’s unclear when this is going to happen or when it started.
I posted about Verizon beginning this transition back in May of 2016: Changes coming to Verizon email. The wording on the AOL page I link to is very similar to the wording on the page that was passed around yesterday.
Without a date it’s hard to really provide any advice, other than to maintain your list hygiene (you do have list hygiene programs, right?) and remove addresses that hard bounce. Quite honestly, I don’t think this will really have any effect on delivery. It doesn’t appear these changes are happening all at once, and Verizon customers have the option to keep their verizon.net address. They’re just going to have to access it differently.
For companies that use an email address as a primary key for logins or accounts, it’s probably a good time to contact customers with a verizon.net address and ask them to update their address. That’s a good idea most of the time, but when we know changes are happening at a domain level, it’s a requirement.

dead addresses • email addresses • verizon