I never used DBIx::Class, but I see two flaws in your search statement: 
my @proc_requests = $schema->resultset( 'TblRequests' )->search({
                -or => [
                      status => 'Offered',
                      status => 'Denied',
                      status => 'Cancelled',
                      status => 'Conditional Offer',
                  ],
                    -and => [
                        -or => [
                                sent_email => {'!=', undef },
                                sent_email => {'!=', '0000-00-00'},
                         ],
                      ],
               },
               { prefetch => 'p' }
     );

[download]
I sent this through perltidy, which renders 
my @proc_requests = $schema->resultset('TblRequests')->search(
    {
        -or => [
            status => 'Offered',
            status => 'Denied',
            status => 'Cancelled',
            status => 'Conditional Offer',
        ],
        -and => [
            -or => [
                sent_email => { '!=', undef },
                sent_email => { '!=', '0000-00-00' },
            ],
        ],
    },
    { prefetch => 'p' }
);

[download]
  1. "and" is on the same level as the preceding "or". I doubt this will be translated to SQL the way you intend.
  2. The last "or" will be true for all records. You say "defined or not zero", while you probably meant "neither undefined nor zero"
What you may have intended, might be 
my @proc_requests = $schema->resultset('TblRequests')->search(
    {
        -or => [
            -or => [
                status => 'Offered',
                status => 'Denied',
                status => 'Cancelled',
                status => 'Conditional Offer',
            ],
            -and => [
                sent_email => { '!=', undef },
                sent_email => { '!=', '0000-00-00' },
            ],
        ],
    },
    { prefetch => 'p' }
);

[download]
(at least this looks more "logical" to me)

In reply to Re^3: Problems Using Join in DBIx::Class by soonix
in thread Problems Using Join in DBIx::Class by phildeman

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