unable to collect emails from gmail accounts

For 2 week before after update - having issues to send emails - but receiving ok, from this weekend unable to receive any email or send it. No errors on receiving ...

For 2 week before after update - having issues to send emails - but receiving ok, from this weekend unable to receive any email or send it. No errors on receiving - then try send - it's say unable to find server. That can i do to fix this? Where i can find a error message then it's ask for authorisaton via pop?