E-mail sent has not been sent at correct time.

 Hello.  The reasons for the delay can be many but proof of confirmation will not be shown! The main reason may be the lack of access to the Internet, due to an ongoing update, the attachment e.g. was quite large and the download the first time failed , -too low battery, etc. Your mistake was not to immediately check if the mail server accepted the task to be carried out! If you could prove the probable cause and what it was about!