android with a circle and a diagonal line preventing sending messages

[ematech]

i had power instability while charging my phone and now i can not send outlook mails from it,also there is a circle with a diagonal line from top left to bottom right near the network icon,what is the problem and how can i solve it
it is a techno android that was working just fine sending mails but now since thst power issue,it no more sends mails

 

[belodion]

The icon may indicate that you have Do Not Disturb mode switched on.