If your computer system is running a slow internet connection, it could take a while for your email to send. Thus, the major cause of the Gmail Not Sending Emails problem is poor internet speed. Additionally, if there is a temporary server-side issue, then also emails will not send even after attempting too many times. In order to deal with this problem, you need to implement the below-noted intuitive fixing guide:
1) Double-check recipients and email details
2) Configure the Gmail server appropriately
3) Clear cache and data
4) Reinstall the Gmail app
5) Discard the Google Account and add it again properly
That’s it! Your Gmail will probably now start sending emails frequently and fluently.