Question regarding FLOCK or POSIX with Sendmail 8.13.x and MailScanner.

Duncan, Brian M. brian.duncan at
Thu Nov 2 14:05:32 GMT 2006

> Earlier this year, there was an internal inconsistency within
> MS which I spotted at 4.54.6 .
> In "MailScanner.conf" the comments describing the default "Lock Type"
> (i.e. left blank) behaviour said 'it defaults to "posix"',
> but the actual behaviour (when left blank) was to set it to "flock".
> That is, the comments said MS would behave one way but its
> actual behaviour was the opposite.
> See threads starting at:
> 061887.html
> and Julian's acknowledgement and fix at:
> 061974.html
> So either upgrade to a more recent version (than 4.54.6) or
> if you need to stay back at 4.54.6 then explicitly state
> which lock type you want.
> Hope that helps.

Thank you for the information.  I found those this morning when doing
further searches.

I am hesitant to turn posix on, on my main server that has been using
Sendmail 8.13.x and flock for months now without issue.

I am starting with a lower load box first.  I am afraid that it will
cause a duplication issue.  It seems to with some sendmail 8.12.x users,
and when they show their compiled options I don't see flock listed.

Here is one posting from a recent person with the duplicating message
issue that was using Sendmail 8.12.11:

>Yes I'm using sendmail.
># sendmail -d0.1
>Version 8.12.11

Since he does not have FLOCK shown in his compiled options, shouldn't of
Posix worked for him? (Everything was ok when he switched to flock) - I
looked at an older box I have here with sendmail 8.12 on it and I don't
have flock shown as a compiled option.  I thought it was supposed to
show you if flock support is compiled into sendmail.

Can someone please explain to me how it is determined that with Sendmail
8.13.x + versions you have to use posix? Is there any way to determine
100% that your sendmail compile is already using Posix and NOT flock?
Looking for flock in the compiled options does not look to be accurate
based on the above post I included. (He had to switch to flock to make
his work, yet flock does NOT show up in his compiled options)


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