Cannot send email user name or password is incorrect

I have an iPhone 3Gs with 6.1.6 iOS software and gmail. Until last week I could receive and send emails on my phone. Last week I tried to email a photo from my iPhone and received the following message "Cannot send email the user name or password is incorrect".  About 30 minutes later I received an email message from google accounts with a sign-in attempt blocked message.  Since then I have not been able to send an email from my phone.  Every time I try to send an email I get the "User name or Password for Gmail is incorrect" - message.  I changed passwords but that didn't help. I can receive emails on my phone but I can't send them. The only way I can send email is by clicking on the less secure apps button on the google accounts settings page..  Why do I get this message now and how can I get gmail working on my phone like it used to?  If I delete my gmail account does it just remove it from the phone where the same account can be reinstalled or is it completely gone for good?

Hey YodaObi,
Thanks for the question. If I understand correctly, you are not able to send emails but are able to receive them. I would recommend that you read this article, it may be able to help the issue.
Get help with Mail on iPhone, iPad, and iPod touch - Apple Support
Log in to your email provider's website to make sure that the account is active and the password is correct.
Make sure your settings are correct using Mail Settings Lookup.
Restart your iOS device.
Delete the affected email account from your device.
Tap Settings > Mail, Contacts, Calendars.
Tap the affected email account.
Tap Delete Account.
Add your account again.
Thanks for using Apple Support Communities.
Have a good one,
Mario

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