mod_sasl2: Further break up success handling, into pre/post stream:features
This allows us to enable mod_smacks after sending success, but before sending
stream:features. Previously, the features were being calculated before SM was
finalized on the session.
We can't finalize SM before sending <success> because it may generate stanzas.
This module lets you block connections to remote servers at the s2s
level.
``` {.lua}
s2s_blacklist = {
"proxy.eu.jabber.org",
}
```