error 550 with,uk

  Kingfisher 19:26 03 Feb 2010

my friend has just changed pc's and I i have set up her email account, wth blueyonders correct pops ans smtp in outlook express. She can send an email and receive emails,but if somebody sends her a reply to one of her emails it bounces back with this error message " remote host said administrative error 50 unable to validate recipient" but if you send a reply as a forward or a new email they receive the message ok, have googled it but not much help, any ideas please.
I should say that if she sends herself an email she receives it ok.
Os win xp and using outlook express
many thanks

  Devil Fish 19:40 03 Feb 2010

this may relate to your problem

click here

  Kingfisher 14:38 05 Feb 2010

apologies in getting back to you,but the settings are all as your link suggests, will have to go round there and talk to tech support
many thanks

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