[Mailman-Users] 'Read-only file system' when processing posts

[Robert Heller]

At Thu, 1 Mar 2018 19:31:50 -0800 Mark Sapiro <mark at msapiro.net> wrote:

> 
> On 03/01/2018 06:53 PM, Jesse B. Crawford wrote:
> > 
> > The one idea I've thought of so far is a chroot issue since parts of
> > Postfix run chrooted, but my understanding is that the 'local' delivery
> > is not run in a chroot, and checking the postfix master.cf bears this
> > out as it is marked 'n' in the chroot column. I can see from the
> > logs/bounces that the local delivery binary is the one that's invoking
> > mailman and encountering the error.
> 
> 
> Yes, and the documentation for 'local' is very clear that it will run
> the command as the user that owns the aliases.db file.
> 
> The only thing I can think of is that when Postfix invokes the
> /usr/local/mailman/mail/mailman command, the SETGID bit is not being
> honored for some reason, but even if that were the case it should be
> running as group mailman at that point anyway so the effective gid
> should be Mailman's in any case.
> 
> It clearly has something to do with Postfix being somehow different from
> everything else, but I'm at a loss to understand what that might be.
> 

One other thing to consider is SELinux...  If the SELinux contex is set wrong, 
you might have this sort of problem.

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