...

struct MailPass
{
	char *mail;
	char *pass;
};

...

int main(void)
{
    ....
    MailPass *	CurrentMailPassPointer;
    MailPass	CurrentMailPass;
    ...
    CurrentMailPassPointer = MailPassRead(MailPassList);
		CurrentMailPass.mail = (* CurrentMailPassPointer).mail;
		CurrentMailPass.pass = (* CurrentMailPassPointer).pass;

...
}

MailPass *MailPassRead(FILE *fd)
{
       ......
       MailPass mailpass;
	char a[255] = "\0";
	mailpass.mail = new char[sizeof(strtok(a,";"))];
	mailpass.pass = new char[sizeof(strtok(0,";"))];
	strcpy(mailpass.mail,strtok(a,";"));
	strcpy(mailpass.pass,strtok(0,";"));
         ....
	return &mailpass;
}