Echo only gives me the first part of string

Edit your code thusly:

 $meta_key = 'agency_email';
 $agency_emails = $wpdb->get_col( $wpdb->prepare( "SELECT meta_value FROM $wpdb->postmeta WHERE meta_key = %s", $meta_key ) );
 var_dump( $agency_emails );
 foreach ( $agency_emails as $ae ) {
  echo $ae; 
 }

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