e335cf5b04
1. The ACL conditions regex and mime_regex now capture substrings
into numeric variables $regex1 to 9, like the "match" expansion condition.
2. New $callout_address variable records the address used for a spam=,
malware= or verify= callout.
3. Transports now take a "max_parallel" option, to limit concurrency.
4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
The latter expands to a 8-element colon-sep set of hex digits including
leading zeroes. A trailing ipv4-style dotted-decimal set is converted
to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
The former operator strips leading zeroes and collapses the longest
set of 0-groups to a double-colon.
5. New "-bP config" support, to dump the effective configuration.
6. New $dkim_key_length variable.
7. New base64d and base64 expansion items (the existing str2b64 being a
synonym of the latter). Add support in base64 for certificates.
8. New main configuration option "bounce_return_linesize_limit" to
avoid oversize bodies in bounces. The dafault value matches RFC
limits.
9. New $initial_cwd expansion variable.
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