Bushfiva.....
There's a generic explanation (via link) from AOL each time, covering everything from possibly too many email's from my IP address to AOL (two a day, average) to non disclosed servers within ISP's network. But this doesn't explain why
Outlook is not working at all now to AOL addresses, yet
ThunderbirdPortable is. Both are working from the same laptop on the same SMTP settings (?).
IO540.....
I realise why
Webmail is a separate issue.
I am using an authenticated SMTP server;
1and1 being my third party email host, via T-Mobile 3G.
Thanks to both; still puzzled by
Outlook/ThunderbirdPortable discrepency.