Though this issue has come on the list a couple of times before also .. but i couldn't find a solution.
A have a mailing list with most of the emails going to hotmail.com.
 
Many bounce with a message:
64.4.49.71_failed_after_I_sent_the_message./Remote_host_said:_554_Transaction_failed/
 
what i could summarise from the previous discussions:
1. Hotmail may have some issues with the envelope sender address. (may be due to missing MX record?)
2. Hotmail is broken.
3. Mailboxes at hotmail might be full so it gives this error ...?
 
But couldn't find any solution. Wondering if somebody has discovered what the real cause of the problem is.
 
thanks,
Ketan

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