Upon sending, application shuts down, no email sent

I did a new Windows installation on my PC yesterday. Restored by emclient backup, received emails OK. This morning I tried to send emails, but on clicking send, the application shut down, no emails were sent, no emails in the Drafts section. What can I do? Thank you.

are you using gmail? Gmail has an outage today

Thank you! I don’t know what happened, but it’s OK now! Probably Gmail. Thanks again!