Friends,

I have a blckberry user who has the complaint of 
5.1.0 - Unknown address error 571-'sorry, sender address has invalid format 
(#5.7.1 - chkuser)'

I find this in the wiki

 I got tired of adding a new Blackberry server every couple days so I just 
disabled the check for all incoming mail: 
:allow,BADMIMETYPE="",SENDER_NOCHECK="1",BADLOADERTYPE="M",CHKUSER_RCPTLIMIT="50",CHKUSER_WRONGRCPTLIMIT="10",QMAILQUEUE="/var/qmail/bin/simscan"
my Q is this : 1.Is it generally agreed that "disabling the check for all 
incoming mail"
is a good solution? best solution? 

2. are there any - risks downsides? 3. ( most importantly )if I wish to 
disabled the check for all incoming 
mail:allow,BADMIMETYPE="",SENDER_NOCHECK="1",BADLOADERTYPE="M",CHKUSER_RCPTLIMIT="50",CHKUSER_WRONGRCPTLIMIT="10",QMAILQUEUE="/var/qmail/bin/simscan"
 exactly how do I do that?

meaning do i just open a terminal as root and enter
:allow,BADMIMETYPE="",SENDER_NOCHECK="1",BADLOADERTYPE="M",CHKUSER_RCPTLIMIT="50",CHKUSER_WRONGRCPTLIMIT="10",QMAILQUEUE="/var/qmail/bin/simscan"
and hit enter  ... or do i write that to a config somewhere?

and for what it is worth ... I have several blackberry users , only 1 has had 
this problem ( same lady ) and it comes and goes ... well it's back now...
(    and she is a dream to deal with    :)

Thanks

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