don't load plugins twice.
Not exactly sure where that feature crept in some time ago. It was suppressed by checking to see if a queue plugin was already registered, and then bailing out on subsequent register_hook runs. I noticed it in testing, b/c I didn't have a queue plugin loaded. This removes the duplicate calls to register_hook.
* adds caching of the AUTH methods. You can't add new plugins or register new
hooks w/o restarting QP, so cache the list and avoid having to generate it on every connection.
* other PBP changes (early exits, less indention, fewer unnecessary parens, etc.)
Previously the greylist plugin tried to use redis and fell back to DBM. This means that if a system already had an established DBM database, but happened to have Redis running, the existing DBM db would be abandoned for a new Redis DB. This would inevitably lead to more delays for legitimate mail, and possibly lost mail.
This adds a 'redis_server' argument which enables Redis and sets the location of the redis server; if it is not explicitly set, DBM is used instead.
If the redis server is unavailable, rather than failing to start QP, we instead fail to register the plugin.
Previously, the GeoIP plugin would crash on certain missing GeoIP data.
Now it will continue to operate on whatever data it can get at.
Note that it already warns when any data it's looking for is missing.
This doesn't really change anything, because the SPF plugin generally is listed in config/plugins before the `data_post` plugins that do content evaluation. This merely assures that regardless of the ordering of plugins in config/plugins, the SPF results header will be present.
- Add "p0f" to error output to aide in debugging
- Remove some no-ops which called only '... if $@', in a context
where $@ would never be set, or never be meaningful.
These are noops: clients that retry before grey_timeout is exceeded and
clients that retry after grey_timeout is exceeded all pass greylisting until
expired by white_timeout.
