Sending email From Manger Is Not working

Dear All,

Im trying to send email from manger to clients but its not going through can anybody please help me about this

Thanks

Update your software. Most email problems have been fixed by very recent updates.

Can you please tell me how to update the manger

Just download and run setup. (Backup your business before you update Manager)

https://www.manager.io/desktop/download

What operating system?

Its windows 10