Is it true that the Queue-ID is generated before Postfix receives the
message content? After which SMTP command?
By default during the RCPT TO stage. But can be changed to happen earlier
during the MAIL FROM stage with performance trade offs.
http://www.postfix.org/postconf.5.html#smtpd_delay_open_until_valid_rcpt
smtpd_delay_open_until_valid_rcpt (default: yes)
------------------------------------------------
Postpone the start of an SMTP mail transaction until a valid RCPT TO command
is received. Specify "no" to create a mail transaction as soon as the Postfix
SMTP server receives a valid MAIL FROM command. With sites that reject lots
of mail, the default setting reduces the use of disk, CPU and memory
resources. The downside is that rejected recipients are logged with NOQUEUE
instead of a mail transaction ID. This complicates the logfile analysis of
multi-recipient mail. This feature is available in Postfix 2.3 and later.
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