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Error 550


Error 550

Using Yam, an excellent batch email client, which I have used before with no problems when I used to be with Home Choice.

With PlusNet, I get "opened connection to mail server
Message returned by SMTP server : Rq=9 Error=550 Requested action not taken: mailbox unavailable connection to mail server now closed"

What gives? Settings (, no authentification, etc...) are as per those of my normal email clien, Foxmail, which works fine, and is obviously closed when using Yam.