If you want to get admin email address or store email address that is set in magento backend, you can get as following.

General Contact

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

Sales Representative

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

Customer Support

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

Custom Email 1

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

Custom Email 2

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