[CentOS] postfix install error: fatal file /etc/postfix/main.cf: parameter setgid_group: unknown group name: postdrop

Thx for your answer.

Ned Slider schrieb:
> Rainer Traut wrote:
>> Trying to switch from sendmail to postfix I did:
>>
>> # yum remove sendmail
>>
>> which resulted in erasing of:
>> mdadm sendmail-doc sendmail sendmail-cf mutt fetchmail redhat-lsb
>>
>> I did then:
>>
>> yum -y install redhat-lsb.x86_64 postfix
>>
>> and got this error:
>>
>>   Installing: postfix                      ######################### 
>> [1/2]
>> postfix: fatal: file /etc/postfix/main.cf: parameter setgid_group: 
>> unknown group name: postdrop
>> warning: group postdrop does not exist - using root
>> warning: group postdrop does not exist - using root
>> warning: group postdrop does not exist - using root
>> warning: group postdrop does not exist - using root
>>   Installing: redhat-lsb                   ######################### 
>> [2/2]

> You don't need to remove sendmail, you can just use system-switch-mail 
> to set postfix as the MTA.
> 

I knew that thx.
I tested the exact same steps on our internal testmachine. Must admit it 
has EL5.2 x86_64 on it but did not show this behaviour.

Rainer