Dovecot LMTP tries to access a directory of a different user, than the one it actually changed to.

[Ernest Deak]

Adding r= field into the Mlocal definition of sendmail.cf worked out.
However, I dug around the documentation and found a macro one can define
to achieve this without having to mess around with the .cf file.

I am adding this here for anyone who might encounter the same problem.

In an .mc file, you can write:

define(`LOCAL_MAILER_MAXRCPTS',`1')

To achieve the same effect.

Thanks to all for the hints.

On 03.07.2015 15:09, Steffen Kaiser wrote:
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> On Fri, 3 Jul 2015, Ernest Deak wrote:
>
>> Hello, I encountered a problem when trying to send an email to 
>> multiple recipients.
>
>> Jul  3 12:34:57 dhcp90 dovecot: lmtp(24106, tester): Error: 
>> stat(/home/han.solo/mail/.imap/INBOX/dovecot.index.log) failed: 
>> Permission denied (euid=802(tester) egid=800(kerber) missing +x perm: 
>> /home/han.solo, euid is not dir owner)
>> Jul  3 12:34:57 dhcp90 dovecot: lmtp(24106, tester): Error: 
>> open(/home/han.solo/mail/.imap/INBOX/dovecot.index) failed: 
>> Permission denied (euid=802(tester) egid=800(kerber) missing +x perm: 
>> /home/han.solo, euid is not dir owner)
>> Jul  3 12:34:57 dhcp90 dovecot: lmtp(24106, tester): 
>> 70NxN1FlllUqXgAA0vrzwA: msgid=<55966551.IfKOMu/T0WTB9M5x%vader at 
>> dhcp90.#####>: save failed to INBOX: BUG: Unknown internal error
>
>> My MTA is sendmail
>> I am using dovecot-lmtp for local delivery
>> Mailbox format is mbox
>> Configured managesieve plugin to listen on 4190. (not sure if this is 
>> even related but it might)
>>
>> The problem I see is that lmtp(user1) tries to access the home 
>> directory /home/user2 and I cannot figure out the reason why.
>> This only happens when sending mails to multiple recipients.
>
>> I see the that lmtp complains that it doesn't have execute 
>> permissions. But I don't want to place execute permissions for others 
>> on the entire /home/* dir structure.
>
> as far as I remember there had been (or is) a bug in Dovecot, that 
> privilegues are not changed correctly when delivering to another user. 
> If that's the case, limit the number of recipients per LMTP message to 
> 1, see r= field in mailer definition in op.me.
>
> - -- Steffen Kaiser
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