Deletion from the cloud
When I delete all mail from the Apple Mail program will my mail remain in Gmail?
iPhone 6s, iOS 10
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Is it from Mac / or iPhone , apple mail application is configured with web account using gmail services , the mails are moved into the trash , however you keep the settings delete them in particular days , it depends upon your service provider to keep the mails for number of days in gmail web account they are deleted after 30 days https://support.google.com/mail/answer/7401?co=GENIE.Platform%3DiOS&hl=en&oco=0
Read https://support.apple.com/en-in/guide/iphone/iphb02be90ba/ios
https://support.apple.com/en-in/guide/mail/mlhlp1001/mac
if there are two accounts say example1@gmail.com and example2@icloud.com in your system preferences - internet accounts and you delete the mails from gmail account the mail will be move to trash folder of it , in the same way for icloud account .
All mails are set up in web mail account .