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Docs: add notes on smtps
author
Jeremy Harris
<jgh146exb@wizmail.org>
Sun, 11 Nov 2018 18:08:05 +0000
(18:08 +0000)
committer
Jeremy Harris
<jgh146exb@wizmail.org>
Sun, 11 Nov 2018 18:08:05 +0000
(18:08 +0000)
doc/doc-docbook/spec.xfpt
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diff --git
a/doc/doc-docbook/spec.xfpt
b/doc/doc-docbook/spec.xfpt
index 4e99e6c0df350d3de3e94a18f1dcc8632ae3460d..8e083d63a2f1eed380b8445fc0b81b4d46d7b9d3 100644
(file)
--- a/
doc/doc-docbook/spec.xfpt
+++ b/
doc/doc-docbook/spec.xfpt
@@
-24569,10
+24569,17
@@
variable that contains an outgoing port.
If the value of this option begins with a digit it is taken as a port number;
otherwise it is looked up using &[getservbyname()]&. The default value is
If the value of this option begins with a digit it is taken as a port number;
otherwise it is looked up using &[getservbyname()]&. The default value is
-normally &"smtp"&, but if &%protocol%& is set to &"lmtp"&, the default is
-&"lmtp"&. If the expansion fails, or if a port number cannot be found, delivery
+normally &"smtp"&,
+but if &%protocol%& is set to &"lmtp"& the default is &"lmtp"&
+and if &%protocol%& is set to &"smtps"& the default is &"smtps"&.
+If the expansion fails, or if a port number cannot be found, delivery
is deferred.
is deferred.
+.new
+Note that at least one Linux distribution has been seen failing
+to put &"smtps"& in its &"/etc/services"& file, resulting is such deferrals.
+.wen
+
.option protocol smtp string smtp
.option protocol smtp string smtp
@@
-24589,7
+24596,11
@@
over a pipe to a local process &-- see chapter &<<CHAPLMTP>>&.
If this option is set to &"smtps"&, the default value for the &%port%& option
changes to &"smtps"&, and the transport initiates TLS immediately after
connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
If this option is set to &"smtps"&, the default value for the &%port%& option
changes to &"smtps"&, and the transport initiates TLS immediately after
connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
-The Internet standards bodies strongly discourage use of this mode.
+.new
+The Internet standards bodies used to strongly discourage use of this mode,
+but as of RFC 8314 it is perferred over STARTTLS for message submission
+(as distinct from MTA-MTA communication).
+.wen
.option retry_include_ip_address smtp boolean&!! true
.option retry_include_ip_address smtp boolean&!! true