I'll recommend Gmail (though actually I usually use Thunderbird and it would be my first rec but if you want a non desktop client or just to have another answer/option I'll add a GMail recommendation anyways).


You can create custom autoresponders.
AFAIK Gmail does NOT have any graph generation options
With Chrome (and I think Firefox as well now) you can configure Gmail to provide desktop notifications
I'd say it is a pretty friendly UI.
Pricing: Advertising (minimal text based) supported. (ie free to the end user like you but there are ads). 15GB (and increasing by around 130MB/year) is included for free (shared between Google Drive, GMail and Google Photos). If you need more storage you can purchase that - currently $4.99/month for 100GB or $9.99/month for 200GB.


You can check (via) POP3 external accounts and reply as them:


A desktop e-mail client for multiple accounts
How do I use Javascript to change the width of an object when the screen is resized to a smaller width? When the screen is resized back to the bigger size, I want the bigger object.
