Tag Archives: sbs

SBS 2008: Emails not received or bouncing

Small Business Server 2008 contains (amongst other things) Exchange 2007. This means that email handling is done on-premises rather than by an SMTP/IMAP/POP3/Exchange server hosted out on the internet somewhere. This has good points and bad points. The good is … Continue reading

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SMTP delivery failure – 550 unknown user

A Microsoft Small Business Server 2008 system had stopped receiving external email. Internally Exchange 2007 was working fine, and it was also sending email out quite normally too.¬†Incoming emails were bounced with a message of: 550 unknown user I checked … Continue reading

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