Get Store Email Addresses

# General Contact

/* Sender Name */
Mage::getStoreConfig('trans_email/ident_general/name'); 

/* Sender Email */
Mage::getStoreConfig('trans_email/ident_general/email');

# Sales Representative

/* Sender Name */
Mage::getStoreConfig('trans_email/ident_sales/name');

/* Sender Email */
Mage::getStoreConfig('trans_email/ident_sales/email');

# Customer Support

/* Sender Name */
Mage::getStoreConfig('trans_email/ident_support/name'); 

/* Sender Email */
Mage::getStoreConfig('trans_email/ident_support/email');

# Custom Email 1

/* Sender Name */
Mage::getStoreConfig('trans_email/ident_custom1/name'); 

/* Sender Email */
Mage::getStoreConfig('trans_email/ident_custom1/email');

# Custom Email 2

/* Sender Name */
Mage::getStoreConfig('trans_email/ident_custom2/name'); 

/* Sender Email */
Mage::getStoreConfig('trans_email/ident_custom2/email');

source : http://www.pauldonnelly.net/magento-get-store-email-addresses/