There is many situations and cases of uses, the only app that i see to have this option is typeApp(aka typeMail,blu mail) but i don't like it, i like to use AquaMail
In the case of my country Cuba,
the mayority of people uses only the phone to access to the @nauta.cu
because this and mms is the only service that can be consumed via mobile data
and no use any other device,(even some people only buy android smartphones to use these service)
when the mail is full in the server (50MB) they need to do a manual empty,(another app if the user knows or have to go to one Etecsa Telecomunications company office)
if change the phone or do a factory reset or configure again the mail
the phone downloads again the mail and the mobile data has cost for already download mail
the fact is this feacture is useful and all mobile apps(android,blackberry,iphone...etc) don't have because the reason that you say that is the true in the must cases
but we are the exception that need or use as a basket
Many people use and like AquaMail in Cuba have useful feactures,
it competes whit the stock app, TypeMail and K-9 variants
the only that people like more TypeMail is this option(but other feactures are not present)
It has a option named
"Delete Mensages from server"and the user can chose :
- Never
- When deletes from the recicler
- When Download
And if you implements this simple feacture you gain a lot of users of Cuba that will go to change to AquaMail