Getting the error "SMTP server cannot create a file in the queue directory C:\Inetpub\mailroot\Queue\"

Posted by Glenn Slaven on Server Fault See other posts from Server Fault or by Glenn Slaven
Published on 2010-07-30T00:47:55Z Indexed on 2012/12/08 23:10 UTC
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We're using the default SMTP server for our websites to send mail with, but in the last day sending messages started getting this error:

Insufficient system storage. The server response was: 4.3.1 Out of memory

Further digging found this message in the System event log:

SMTP server cannot create a file in the queue directory C:\Inetpub\mailroot\Queue\

I've since given the Everyone account full control of the mailroot folder but it's still happening. There's enough space on the server and to the best of my knowledge nothing on the server has been changed

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