wannadoo as now is
...not for
long
The solution is to have an SMTP server that allows relaying.
in english: subscribe to a service which allows you to send email irrespective or where you are and which ISP and/or email provider you are using.
If you Google "relaying servers" or similar keywords you will have a plethora of adverts fo such services, none of which I hasten to ad have had my custom - 'cause I manage my own server...
hth
Charles