1) blackholes.mail-abuse.org is the same as FEATURE(dnsbl), so specifying
it in the "Other DNS based black hole lists" section leads to confusion of
specifying it twice.
2) Formatting issues. If error diagnostic not enclosed in double quotes,
varius visual artefacts appearse like 1) no space after ; and 2) redundant
space after ? (in CGI request), so I add quotes where needed.
3) FEATURE(dnsbl) directly use error code 550 by default, so I made other
dnsbl variants use the same error code too.
4) Comment relays.* list as "open relays" list, just "other" word is not
explain enough.
Submitted by: ache
Beyond changes to the build system, this includes fixing up the sample
freebsd.mc configuration for changes in defaults and syntax, removing
outdated documentation, and updating the release notes.
I have not enabled rbl by default, I understand an 'opt-in' is a key part
of it's legal protection.
Activate a few optional features (access_db, virtusertable, etc) which will
operate if (and only if) the corresponding table is created.
I've also turned on the MIME buffer overflow checking with sendmail.org's
recommended values (256/128).
