fix(transfer): fix parameter name mismatch in CONF_ENV and TransferGateway

- CONF_ENV had 'mail' but TransferGateway.__init__ expects 'email'
- TransferGateway had 'from_email' typo (undefined NameError) → 'from_mail'

unipay/init.py

@@ -15,7 +15,7 @@ from .payfee import get_pay_fee, sor_get_pay_fee, get_paychannels, get_pay_feera
 CONF_ENV = {
 	"transfer": {
 		"pop3server": "POP3SERVER",
-		"mail": "MAIL",
+		"email": "MAIL",
 		"password": "PASSWORD",
 		"from_mail": "FROM_MAIL",
 		"account_no": "ACCOUNT_NO"

unipay/providers/transfer.py

@@ -66,7 +66,7 @@ class EmailClient:
 
 class TransferGateway(Gateway):
 	def __init__(self, from_mail="", pop3server="", email="", password="", account_no=""):
-		self.from_email = from_email
+		self.from_mail = from_mail
 		self.pop3server = pop3server
 		self.email = email
 		self.password = password