On Tue 16/Mar/2021 07:11:39 +0100 Claus Assmann wrote:
On Mon, Mar 15, 2021, Ned Freed wrote:
Which establishes the precedent for parsing replies given a signal
to do so.
draft-santos-smtpgrey has something like that for graylisting:
421 4.7.0 Come back later. retry=123
^^^^^^^^^
That could be a fair idea. Strawman below, along with a few nits.
Best
Ale
--- draft-freed-smtp-limits-01.md 2021-03-17 11:01:19.392667148 +0100
+++ draft-freed-smtp-limits-02.md 2021-03-17 11:20:30.316669820 +0100
@@ -24,6 +24,7 @@
ABNF: RFC5234
SMTP: RFC5321
PIPELINING: RFC2920
+ GREYLISTING: RFC6647
informative:
STARTTLS: RFC3207
@@ -204,9 +205,9 @@
Name: MAILMAX
-Value syntax: %x30-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
+Value syntax: %x31-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
-Description: RCPTMAX specifies the maximum number of transactions
+Description: MAILMAX specifies the maximum number of transactions
(MAIL FROM commands) the SMTP will accept in a single session. The
count includes all MAIL FROM commands, regardless of whether they
succeed or fail.
@@ -218,7 +219,7 @@
Name: RCPTMAX
-Value syntax: %x30-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
+Value syntax: %x31-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
Description: RCPTMAX specifies the maximum number of RCPT TO commands
the SMTP will accept in a single transaction. It is not a limit
@@ -233,9 +234,9 @@
Name: RCPTDOMAINMAX
-Value syntax: %x30-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
+Value syntax: %x31-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
-Description: RCPTMAX specifies the maximum number of different domains
+Description: RCPTDOMAINMAX specifies the maximum number of different domains
that can appear in a recipient (RCPT TO) address within a single
SMTP session. This limit is imposed by some servers that bind to
a specific internal delivery mechanism on receipt of the first
@@ -243,6 +244,20 @@
Security Considerations: See {{Seccons}}
+GREYLISTING Limit
+-------------
+
+Name: GREYLISTING
+
+Value syntax: %x31-39 0*5DIGIT ; 0 not allowed, 6 digit maximum
+
+Description: GREYLISTING specifies the minimum number of seconds
+that a client should wait before retrying to submit the same message.
+The presence of this limit implies that the client MAY receive a
+transient 4xx response. See {{GREYLISTING}}
+
+Security Considerations: See {{Seccons}}
+
Security Considerations {#Seccons}
=======================
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