[Spamassassin Wiki] Update of "CantCallMethodBgsend" by JustinMason

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The following page has been changed by JustinMason:
http://wiki.apache.org/spamassassin/CantCallMethodBgsend

New page:
= Errors about 'Can't call method "bgsend" on an undefined value' =

The following errors are indicative:

{{{
Failed to run [SOMERULENAME] RBL SpamAssassin test, skipping:
(Can't call method "bgsend" on an undefined value at
/usr/local/lib/perl5/site_perl/5.6.2/Mail/SpamAssassin/Dns.pm line 112. )
}}}

for example --

{{{
Jul 26 12:43:36 cain mimedefang-multiplexor[80550]: Slave 0 stderr: Failed to run __RFC_IGNORANT_ENVFROM RBL SpamAssassin test, skipping:       (Can't call method "bgsend" on an undefined value at /usr/local/lib/perl5/site_perl/5.6.2/Mail/SpamAssassin/Dns.pm line 112. )
> Jul 26 12:43:36 cain mimedefang-multiplexor[80550]: Slave 0 stderr: Failed to run NO_DNS_FOR_FROM RBL SpamAssassin test, skipping:      (Can't call method "bgsend" on an undefined value at /usr/local/lib/perl5/site_perl/5.6.2/Mail/SpamAssassin/Dns.pm line 141. )
> Jul 26 12:43:36 cain mimedefang-multiplexor[80550]: Slave 0 stderr: Failed to run DNS_FROM_AHBL_RHSBL RBL SpamAssassin test, skipping:  (Can't call method "bgsend" on an undefined value at /usr/local/lib/perl5/site_perl/5.6.2/Mail/SpamAssassin/Dns.pm line 112. )
}}}

Charles Sprickman notes: 'Quick answer if you're running FreeBSD and using Net::DNS from ports... Install the p5-IO-INET6-2.01 port or package.  I ran into this, and I 
checked with Daniel and it worked for him as well.  It appears someone 
missed that as a dependancy on the latest Net::DNS port.'

JustinMason: this can also occur on non-MIMEdefang setups, I think, and may even be an issue on non-FreeBSD platforms.