smtp_features
smtp_init_crypto(int fd, int feature, struct smtp_features* features)
int smtp_init_crypto(int, int, struct smtp_features*);
int perform_server_greeting(int, struct smtp_features*);
smtp_login(int fd, char *login, char* password, const struct smtp_features* features)
int perform_server_greeting(int fd, struct smtp_features* features) {
struct smtp_features features;