Don't mention the ones you don't care about.
A - Email deliverability
B - Reliability and uptime of QuickMail
C - Adding lots of senders (email & LinkedIn)
D - Adding lots of contacts
E - Integration with other tools (email verification, CRM...)
F - Automation (Zapier/API/Webhook)
G - Auto-warmer
H - Collaboration with team members
I - Client Portal & white labelling
J - Buying Inboxes preconfigured
K - Handling all responses in one place
L - CRM capabilities
M - Advanced stats
N - Team collaboration (audit log)
O - AI (campaigns, drafts...)