We have one company trying to send us email, and they are getting an error message (Remote server returned #5.2.1 - problem with recipients mailbox)
This is an SBS 03 Server w/Exchange 03. I checked the App logs on the server, and its showing this codes:
9667 - Failed to create a new named property for database "First Storage Group\Mailbox Store " because the number of named properties reached the quota limit (8192).
User attempting to create the named property: "SYSTEM"
Named property GUID: 00020386-0000-0000-c000-000000000046
Named property name/id: "x-forefront-prvs"
7515 - An error occurred while Microsoft Exchange Intelligent Message Filter attempted to filter a message with ID <ddf27b72e5b74286b78e2179edeaff13@BN1PR05MB360.namprd05.prod.outlook.com>, P1 From smtp:firstname.lastname@example.org and Subject RE: email issue. This message will not be filtered. The error code is 0x800710f0.