Want to delete my sent mail all at once instead of one by one

you can't
once sent that is it
have you not got an e-mail from a company and read the bit at the bottom that says "this e-mail was sent to joe citizen .If you are not the person delete it and disregard the message"

Your best bet is to contact Google tech support, this will save you a lot of frustration.

Hi!
To delete portion of the sent email.
Log in to your mail service and look for sent and then checked your selected emails to delete. then Click delete.

Unfortunately it can be done. Once the e-mail was sent to the recipient's e-mail server you don't have access to it anymore. Notice that by deleting an e-mail from your mail box you are only erasing your copy of the e-mail.

Unfortunately, once your email leaves the outbox, it is forever sent. There is no way you can retrieve it.

This feature is only available in Microsoft Outlook to Microsoft outlook sent emails.

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Go to "Send mail" and check the box near the flag option above the first mail. And after that just delete them

Please go ahead and delete some old mails

You can take the backup of the mails before deleting them..

Once you delete some of the old mails it would start sending the messages with attachments and would move into Sent items instead of Outbox.

The main reason is that your mail box limit is exceeded.

hi, this is a system fault that can be corrected by shutting down the system and unplugging the entire desktop for 5 minutes. this will rest the mother board and fix this hardware scramble.

Login to your id . Then in inbox at the extreme bottom of all the mails . You can see check all click it and at the top of all mails you can see delete click it . It deletes all received mails . For deleting the sent mails go to the sent option and follow the same procedure .
And go to trash and delete everything thats all .

Hope this helps .

Once you have clicked send and the e-mail has been sent it is out of your control and it cannot be stopped. However you can make sure that have actually sent the e-mail. Check your Drafts folder and see if the mail is there. If you find it there it has not been sent and you can discard the e-mail instead of sending it.