Keep in mind that their email probably doesn't look like your email. There are literally thousands of tools that plug into email and/or build on top of it in so

Keep in mind that their email probably doesn't look like your email. There are literally thousands of tools that plug into email and/or build on top of it in some way. Everything they're sending and receiving is going to be searchable and auditable by multiple entities, both within and outside of the company, and will stand up in court if challenged. Just because they're "using email" doesn't mean they aren't also already using specific tools for this purpose.