[Fix] Do not exclude authenticated users from URIBL lookups

[twesterhever]

Due to this line in the RBL module default configuration file, mails from authenticated users are not subject to any DNSBL lookups. This certainly makes sense for RBLs (i. e. IP-based DNSBLs), but in order to improve detection on outbound spam, URIBLs should be enabled for authenticated users too, so rspamd will notice if a compromised account starts emitting mails containing known bad FQDNs.

Therefore, this patch enables URIBL lookups against SURBL, URIBL, Spamhaus DBL and rspamd.com's DBL for authenticated users. Hopefully it helps reducing the amount of spam sent out though cracked accounts a bit. :-)

[vstakhov]

Yes, that's a good point!