Need to recover a deleted gmail account... can I do anything with Apple to help
How can I recover a deleted gmail account on an Apple device
If you deleted that account from your iPhone only (the account is still active on your PC/Laptop/Mac and data are still on your email provider servers), you just need to re-add that account to your iPhone, using these instructions:--> Add an email account to your iPhone, iPad, or iPod touch - Apple Support
Regards
Giulio