Why does MS rename postfix queue IDs?

[Glenn Steen]

On 02/04/06, Glenn Steen <glenn.steen at gmail.com> wrote:
> On 02/04/06, Mike Jakubik <mikej at rogers.com> wrote:
> > So, as the topic says, why does MS rename postfix queue IDs? Whats is
> > the reason for this?
> >
> > --
> > Apr  2 15:34:01 fbsd postfix/smtpd[18878]: 1EE3E2B2036:
> > client=localhost[127.0.0.1]
> > Apr  2 15:34:01 fbsd postfix/cleanup[18879]: 1EE3E2B2036: hold: header
> > Received:
> > ...
> > Apr  2 15:34:04 fbsd MailScanner[17694]: Requeue: 1EE3E2B2036.F1395 to
> > F39462B2043
> > --
> >
> > Why add the .##### to the ID? Also, is it really necessary to change the
> > ID when re queuing the message?
>
> This is a bit of a FAQ it seems, for the postfix implementation... I
> noticed that with MW and PF, since PF _will reuse queue IDs_, that I
> got a rather disturbing amount of duplicates in my database....
> (Could've been any database logging too, or even a script calculating
> things based on the queue ID. Any such system was bound to have a fair
> amount of errors, particularly if you employ a "less than simplistic
> partitioning scheme", since the amount of continuous i-node
> consumption will play a role too. I had var on its own partition, so
> got hit pretty bad) ... I badgered first Steve for a fix, then
> Jules... Who was gracious enough to oblige.
>
> As mentioned, the whole problem is that the queue ID will be reused,
> since it is calculated from the i-node and the present microsecond...
> Sounds rather random, but simply isn't "random enough" (as Jules
> comment in the code goes:).... Even in some rather common "standard
> setups" you _will_ be bit by this.
>
> Jules solution (to manage some extra randomness, tagged on behind a
> very "scriptabe"/"ignorable" <dot><five hex digits> is purely
> briliant. And no, it should stay, no matter what;-).
>
(Replying to myself.... Sigh:-)
About the requeueing bit, that is necessary, yes. "man postsuper"
tells a lot about the "hoary" details of how PF really works:-).

--
-- Glenn
email: glenn < dot > steen < at > gmail < dot > com
work: glenn < dot > steen < at > ap1 < dot > se