Send and Receive is not working - no error messages- installed today 3.5.12280

Send and Receive is not working. New user, installed today 3.5.12280 configured for Gmail. I’ve deleted and re-added account but nothing happens. No messages, no log entries, no operation takes place when I click S&R button. WindowsXP. Free licence in place.

Further investigations and using diagnostic tool (under the account settings tab) shows the IMAP & SMTP are not working. It tried various options but no success. I will try again on a different network as it may relate to firewall settings.

But I still welcome suggestions as the email client looks good and may also resolve my ongoing challenge with managing contacts.