@simiyu The fault can be on the ISP or user depending on the kind of service the user is on, if @Yawe is on a service where the IP is dynamically assigned and probably natted to different users then the problem could be because of another user and not necessarily @Yawe. @Yawe if your on a static IP assignment then you need to check your LAN if not then keep heaping the blame on Orange /Maxwell simiyu mse wrote:
@ Yawe et al,
The 554 error you get is actually an error indicating that your MTA has been blocked. This could be because your IP is sending spam either intentionally or (usually) unintentionally. Your isp therefore no longer trusts your ip and has hence quarantined it, for a while.
This is usually cleared up when you clean and patch up your LAN and whitelist your IP, on the RBL lists or occasionally manually on your ISP's smtp server.
This hardly is the mistake of the isp, rather a lapse in vigilance on LAN security issues.