How Can a Retired Employee Change Adobe Account Email Address?

My situation cannot be unique. When an employee retires or leaves a company to pursue other opportunities, access to company email accounts ends.  I am retired, but I still do contract work and need to keep my Adobe Plan.  But I cannot log in to my old employer's email anymore.  Adobe requires this step before changing an email address on the plan account.  I fear the day I get logged out of Adobe, as I will not be able to access my account, and getting help directly from Adobe is nearly impossible. Who knows the correct solution for this issue?