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I have been installing ispconfig3 on ubuntu 12.04 what usually configures the mail server as well postfix/dovecot. Creating mailboxes and testing theme no email is going to be droped. My syslog has the following content

lda(test@mydomain): Fatal: setresgid(5000(vmail),5000(vmail),5000(vmail)) failed with euid=5000(vmail): Operation not permitted

I have been searchin hours to fix this permission issue and I still get not get to work

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I have been using ispconfig3 for last 3 years without any problem.

Have you properly followed this guide if you are using Apache.

You can also try chown -R vmail:vmail /var/vmail/ to at least correct the permission problem and check if it works.

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