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둥파 둥파네 2020. 4. 29. 13:36

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

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

 

6번 시도한다.

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