Outlook unable to send on one email
I use Windows 365 Outlook to manage my emails and have four email addresses, three of them are still working but one of the ntlworld addresses will not send an email, it just stays in the Outbox, it receives them OK. Using an iPhone or iPad this email address works OK. There are 57 synch issues with this address, I have used the inbuilt Repair function in Outlook and deleted the address and re-created it but nothing has changed. I cannot make any sense of the solutions to the synch problem that appear on the web. Any help would be appreciated.