Two of my customers who use Orange, one at home, one in a local office, one on ADSL, the other on dial-up are having real problems sending e-mails. Works for a day, then stops working for a while, then starts again, then stops, etc.
No error messages or bounce-backs - e-mails just vanish, so I guess their SMTP servers are playing up.
Anyway, Orange are just about to lose two customers to a reliable ISP!
Just my tuppence-worth....