mail not sending email
Mail is suddenly unable to send emails. I can receive them but I can't send them. It was working perfectly well a couple of days ago and I haven't made any changes to the OS.
I've turned the computer on and off again a couple of times.
I have verified that the webmail versions of my iCloud email and Hotmail email are able to send emails without difficulty.
I have also ensured that I have internet connection.
I've checked Mail>Preferences>Accounts and it looks like both my accounts are "offline"
Similarly, Connection Doctor indicates that IMAP and STMP are offline on both of my accounts.
I have followed the instructions and ensured that the TLS/SSL tick box in the Server Settings is set to None.
I'm running MacOS Mojave Version 10.14.6
Mail Version 12.4
Any ideas on what I should do now? Thanks in advance for any help.
iMac Line (2012 and Later)