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Old 05-23-2008, 01:52 AM   #1
spice_prash
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Registered: Nov 2006
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Changing mailserver sendmail to postfix


Dear all,

WE have a Suse 9 enterprise server with sendmail installed in it for 50 users. Now I want to install a new mailserver using postfix in ubuntu 8.04

My question is how can i import all my users, emails and domains from existing sendmail server to the new server ???
 
Old 05-23-2008, 07:56 AM   #2
sunethj
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Registered: Nov 2006
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1) to get all users you can copy /etc/passwd, /etc/shadow, /etc/group from the old server to the new server and then run pwdconv and grpconv commands. (backup the files in the new box first).

******If you want to add users with a default password to the new server then instead of doing the first step run the command given in second step, copy the resulting file to the new box and run the following script;

#!/bin/sh
for i in `cat /opt/abc.txt`
do
k=123
pass=$(perl -e 'print crypt($ARGV[0], "password")' $i$k)
useradd $i -p $pass
echo $i
echo $pass
done

this will add users with the default password of password123 (change this to a complex one)

2) then you can run;
cut -d":" -f6 /etc/passwd > /tmp/users.txt
to get the list of users to a text file. open it and remove all other than real users.

3) use the following script to create home folders;
#!/bin/sh
for i in `cat /tmp/users.txt`
do
mkdir /home/$i
chown $i:$1 /home/$i
done

this will create home folders and add permission as well.

4) regarding moving mails if possible ask all users to download the mails to their pcs before changing the servers. that'll make things easy.

5) regarding moving domains add those domains to the postfix configuration file and you should be ok with that.

******* if you must move all mails in user folders i think you have to tar (& gzip) and move all home folders to new box. and you might also want to move he mail queue as well. but i haven't done like that.

hope this helps.
 
Old 05-23-2008, 11:12 PM   #3
spice_prash
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Registered: Nov 2006
Posts: 14

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Thanks mate...

It really helps me ...
 
  


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