Updating from RELENG_5_1_2_RELEASE to ... ??

[bsd]

Hello,



I am going to update one of my customer's server from  
RELENG_5_2_1_RELEASE to RELENG_5_3 or RELENG_5_4 or RELENG_5

Which version would you advise me ??


This is a mail server in production (postfix - amavisd -  
spamassassin) so It obviously needs stability.
There is no GUI (X11 or so).


Which version of the system should I stick to ??

What are the risks ?

Which long term policy would you advise me to get this server up and  
running as long as possible ?



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Gregober ---> PGP ID --> 0x1BA3C2FD
bsd @at@ todoo.biz
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