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Last updated criteria

truly reliable message delivery (Why is plain tcp syslog not reliable?)

Yes/No
on the wire (zlib) message compression

Yes/No
support for receiving messages via reliable RFC 3195 delivery

Yes/No
support for IETF's new syslog-protocol draft

Yes/No
support for IETF's new syslog-transport-tls draft

Yes/No
support for IPv6

Yes/No
native ability to send SNMP traps

Yes/No
ability to preserve the original hostname in NAT environments and relay chains

Yes/No
Message Filtering

Header
Filtering for syslog facility and priority

Yes/No
Filtering for hostname

Yes/No
Filtering for application

Yes/No
Filtering for message contents

Yes/No
Filtering for sending IP address

Yes/No
ability to filter on any other message field not mentioned above (including substrings and the like)

Yes/No
support for complex filters, using full boolean algebra with and/or/not operators and parenthesis

Yes/No
Support for reusable filters: specify a filter once and use it in multiple selector lines no

Yes/No
support for arbritrary complex arithmetic and string expressions inside filters

Yes/No
ability to use regular expressions in filters

Yes/No
support for discarding messages based on filters

Yes/No
ability to filter out messages based on sequence of appearing

Yes/No
powerful BSD-style hostname and program name blocks for easy multi-host support

Yes/No
Supported Database Outputs

Header
MySQL

Yes/No
PostgreSQL

Yes/No
Oracle

Yes/No
SQLite

Yes/No
Microsoft SQL (Open TDS)

Yes/No
Sybase (Open TDS)

Yes/No
Firebird/Interbase

Yes/No