on 18-08-2020 12:26 PM
on 17-08-2020 03:13 PM
Are you in the UK? A TalkTalk Consumer or MailPlus customer? And the tiscali mailbox address is added to your MyAccount? View your email addresses.
When you're signed in to the mailbox compose a message to the mailbox address and see if that sends without error. Let us know what the full error message is, if you get one. If sent without error check the mail is copied into the Sent objects folder and arrives and stays in the Inbox.
How do you normally send and receive mail messages?