출처: http://www.cacti.kr/tc/119
[원문]
|
How often does qmail retry to send email? |
Each message has its own retry schedule. The longer a message remains undeliverable, the less frequently qmail tries to send it. The retry schedule is not configurable. The following table shows the retry schedule for a message that's undeliverable to a remote recipient until it bounces. Local messages use a similar, but more frequent, schedule.
|
Delivery Attempt |
Seconds |
D-HH:MM:SS |
|
1 |
0 |
0-00:00:00 |
|
2 |
400 |
0-00:06:40 |
|
3 |
1600 |
0-00:26:40 |
|
4 |
3600 |
0-01:00:00 |
|
5 |
6400 |
0-01:46:40 |
|
6 |
10000 |
0-02:46:40 |
|
7 |
14400 |
0-04:00:00 |
|
8 |
19600 |
0-05:26:40 |
|
9 |
25600 |
0-07:06:40 |
|
10 |
32400 |
0-09:00:00 |
|
11 |
40000 |
0-11:06:40 |
|
12 |
48400 |
0-13:26:40 |
|
13 |
57600 |
0-16:00:00 |
|
14 |
67600 |
0-18:46:40 |
|
15 |
78400 |
0-21:46:40 |
|
16 |
90000 |
1-01:00:00 |
|
17 |
102400 |
1-04:26:40 |
|
18 |
115600 |
1-08:06:40 |
|
19 |
129600 |
1-12:00:00 |
|
20 |
144400 |
1-16:06:40 |
|
21 |
160000 |
1-20:26:40 |
|
22 |
176400 |
2-01:00:00 |
|
23 |
193600 |
2-05:46:40 |
|
24 |
211600 |
2-10:46:40 |
|
25 |
230400 |
2-16:00:00 |
|
26 |
250000 |
2-21:26:40 |
|
27 |
270400 |
3-03:06:40 |
|
28 |
291600 |
3-09:00:00 |
|
29 |
313600 |
3-15:06:40 |
|
30 |
336400 |
3-21:26:40 |
|
31 |
360000 |
4-04:00:00 |
|
32 |
384400 |
4-10:46:40 |
|
33 |
409600 |
4-17:46:40 |
|
34 |
435600 |
5-01:00:00 |
|
35 |
462400 |
5-08:26:40 |
|
36 |
490000 |
5-16:06:40 |
|
37 |
518400 |
6-00:00:00 |
|
38 |
547600 |
6-08:06:40 |
|
39 |
577600 |
6-16:26:40 |
|
40 |
608400 |
7-01:00:00 |
1 , 2 , 3 , 4 , 5 , 6 .....
0 , 400 , 1600 , 3600 , 6400 , x
x 의 값은?
400 , 1200 , 2000 , 2800 , y
y 값은? 4 * 1 = 4 , 4 * 3 = 12 , 4 * 5 = 20 , 4 * 7 = 28 , 4 * 9 = 36
즉 3600 증가된다. 그래서 x = 6400 + 3600 = 10000
어떤 규칙이 있다.
시도 횟수 = (seconds / 4^x * 100) + 1
x를 구하는식???
seconds / 400 = z
z = k ^ 2 이때 k의 값이 시도 횟수가 된다.
예를 들어 보면
10000 초라고 한다면
10000 / 400 = 25
이거는 5 ^ 2 이므로 => 5 여기에다 1을 더하면 6
즉 6번 시도한다.
