New answers tagged data
No. The large email will be uploaded to the server only once, regardless of how many recipients it has. The server will then take care of sending this large email to all its recipients.
The space used in your mailbox/server is independent from the number of receivers and also the data used to upload the file online.
iOS sandboxing prevents apps from getting access to data usage of other apps. That's why iOS has the Data Usage section in Settings to show exactly that. There might be solutions for jailbroken phones, but given your constraints a jailbreak doesn't seem to be an option. PS: If you don't trust the numbers in Data Usage, why would you trust those in a 3rd ...
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