Why is Gmail not sending?
Why is my Gmail not sending or receiving emails? It may be possible that your browser’s or app’s cache may have got corrupted. We suggest you clear your browser cache and see. We also suggest the Gmail Storage Data and see.
Can’t send Gmail but can receive?
Gmail may get you stuck when you did not receive an email, but you can send. … This problem may occur due to email quota issue, email client settings, or DNS settings. If your C panel has surpassed its disk quota, then it can also prevent you from receiving emails. Generally, it happens due to exceeding of disk quota.