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sendmail snapshot 8.17.0.1 is available for testing. Please see
the first entry in the release notes below - if you know someone
who might be affected, please tell them about it.

8.17.1/8.17.1 202X/XX/XX
Deprecation notice: due to compatibility problems with some
third party code, we plan to finally switch from K&R
to ANSI C. If you are using sendmail on a system
which does not have a compiler for ANSI C contact us
with details as soon as possible so we can determine
how to proceed.
Experimental support for SMTPUTF8 (EAI, see RFC 6530-6533)
is available when using the compile time option USE_EAI
(see also devtools/Site/site.config.m4.sample for other
required settings) and the cf option SmtpUTF8.
For mail submission the new command line option -U must
be used to specify SMTPUTF8 and the cf option SmtpUTF8
must be set in submit.cf.
Please test and provide feedback.
Experimental support for SMTP MTA Strict Transport Security
(MTA-STS, see RFC 8461) is available when using
- the compile time option _FFR_MTA_STS (which requires
STARTTLS, MAP_REGEX, SOCKETMAP, and _FFR_TLS_ALTNAMES),
- FEATURE(sts), which implicitly sets the cf option
StrictTransportSecurity,
- postfix-mta-sts-resolver, see
https://github.com/Snawoot/postfix-mta-sts-resolver.git
New ruleset check_other which is called for all unknown SMTP
commands in the server and for commands which do not
have specific rulesets, e.g., NOOP and VERB.
New ruleset clt_features which can be used to select features
in the SMTP client per server. Currently only two
flags are available: D/M to disable DANE/MTA-STS,
respectively.
Avoid leaking session macros for an envelope between
delivery attempts to different servers. This problem
could have affected check_compat.
Avoid leaking actual SMTP replies between delivery attempts
to different servers which could cause bogus logging
of reply= entries.
Change default SMTP reply code for STARTTLS related problems
from 403 to 454 to better match the RFCs.
Fix a theoretical buffer overflow when encountering an
unknown/unsupported socket address family on an
operating system where sa_data is larger than 30
(the standard is 14). Based on patch by Toomas Soome.
Previously the commands GET, POST, CONNECT, or USER terminate
a connection immediately only if sent as first command.
Now this is also done if any of these is sent directly
after STARTTLS or if the 'h' option is set via
srv_features.
CDB map locking has been changed so a sendmail process which
does have a CDB map open does not block an in-place
update of the map by makemap. The simple workaround
for that problem in earlier versions is to create
the map under a different name and then move it
into place.
CONFIG: New FEATURE(`check_other') to provide a default
check_other ruleset.
MAIL.LOCAL: Enhance some error messages to simplify
troubleshooting.
Portability:
Add support for Darwin 19.
NOTE: File locking using fcntl() does not interoperate
with Berkeley DB 5.x (and probably later).
Use CDB, flock() (-DHASFLOCK), or an earlier
Berkeley DB version.
Added Files:
cf/feature/check_other.m4
cf/feature/sts.m4
devtools/OS/Darwin.19.x
libsmutil/t-lockfile.c
libsmutil/t-lockfile-0.sh
libsmutil/t-maplock-0.sh

Available at:
https://ftp.sendmail.org/snapshots/sendmail.8.17.0.1.tar.gz
https://ftp.sendmail.org/snapshots/sendmail.8.17.0.1.tar.gz.sig

SHA256 (sendmail.8.17.0.1.tar.gz) = 4847779d1bebf288f2467ab7c4d1425c3f49cb21cce0d571c549d4879f10ee96
SHA256 (sendmail.8.17.0.1.tar.gz.sig) = 517898cc837175292ba788162944811c5c9e0e517653a933e71515ab00d38ac8
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