--------- | ------------------------------------ | ---------------------------- |
| without FEATURE(`delay_checks') | FEATURE(`delay_checks) |
--------- | ------------------------------------ | ---------------------------- |
1. | call milters for connect | call milters for connect |
| check_relay ruleset | |
--------- | ------------------------------------ | ---------------------------- |
2. | call milters for HELO | call milters for HELO |
--------- | ------------------------------------ | ---------------------------- |
3. | call milters for MAIL | call milters for MAIL |
| check_mail ruleset | |
--------- | ------------------------------------ | ---------------------------- |
4. | call milters for RCPT | call milters for RCPT |
| check_rcpt ruleset | |
--------- | ------------------------------------ | ---------------------------- |
5. | | check_rcpt ruleset |
| | check_mail ruleset |
| | check_relay ruleset |
--------- | ------------------------------------ | ---------------------------- |