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migrating 2.1 to 3.x ?

I currently have Postfix 2.11 /MySQL on Centos 6, looking at migrating to
current Postfix.

current server:
CentOS release 6.x
mail_version = 2.11.0

new server:
CentOS 7.3
mail_version = 2.10.1

reading some of the ML posts: is ghettoforge the way to do it ?
<a href="http://ghettoforge.org/index.php/Postfix" title="http://ghettoforge.org/index.php/Postfix">http://ghettoforge.org/index.php/Postfix</a>

what can or should I do with current main.cf ? master.cf

the idea is to set new server with Postfix 3, have both running till all done

thanks for all the pointers and help

V
(current)
postconf -m

btree
cidr
environ
fail
hash
internal
ldap
memcache
mysql
nis
pcre
pgsql
proxy
regexp
socketmap
static
tcp
texthash
unix