just an idea:
“account? you already have one”
refering to (even if it may be something like gmail or similar) probably everyone owning an email address and delta beeing able to use that.
It’s a great line, and exactly this slogan used to be used, but
- only dedicated e-mail accounts are supported now
- encrypted standards-based interop with other mailclients is curently having some problems with silently-dropped messages. Hopefully as Autocrypt gets more widespread this will improve.
“E-mail in a new dress” was also formerly used.