New Features in Exim release 3.21
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1. The maximum length of a macro name has been raised to 63. A configuration
error occurs if the limit is exceeded.

2. The dns_ipv4_lookup option applied only to DNS lookups; I forgot about the
fact that gethostbyname() also has IPv4/IPv6 variations. I've made
dns_ipv4_lookup apply to gethostbyname() as well as to direct DNS lookups, but
for tidiness I have added a better name, ipv4_address_lookup (defaulting false)
which is actually just a synonym.

3. If quota_warn_threshold was given as a percentage when quota was not set,
Exim objected. Now it just ignores the setting.

4. The -Mmd (mark delivered) option now operates case-insensitively.

5. The -bpc option gives a count of messages on the queue. The output is just a
single number, making it easy to use from a script or program. Because it does
not open any message files, it is faster than post-processing the output of
-bp.

5. The smtp transport has a new option called helo_data which is expanded to
give the text used as the argument for EHLO or HELO. The default setting is
"$primary_hostname".

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