Hye, 

I just wanna ask, on how to read the log for pop. example as below, what is [22599567], is it the ID? 

and how to make sure the email delivered and being deleted from pop.

i have check using delivered log ID - but cannot find the same ID in pop logs.

[2019.04.04] 07:31:13 [123.123.123.123][22599567] connected at 4/4/2019 7:31:13 AM
[2019.04.04] 07:31:13 [123.123.123.123][22599567] USER abc@yabc.com
[2019.04.04] 07:31:13 [123.123.123.123][22599567] PASS XXXX
[2019.04.04] 07:31:13 [123.123.123.123][22599567] abc@yabc.com logged in
[2019.04.04] 07:31:13 [123.123.123.123][22599567] STAT
[2019.04.04] 07:31:13 [123.123.123.123][22599567] +OK 1 980
[2019.04.04] 07:31:13 [123.123.123.123][22599567] RETR 1
[2019.04.04] 07:31:13 [123.123.123.123][22599567] retr completed for message 1
[2019.04.04] 07:31:13 [123.123.123.123][22599567] DELE 1
[2019.04.04] 07:31:13 [123.123.123.123][22599567] message 1 marked for deletion.
[2019.04.04] 07:31:13 [123.123.123.123][22599567] QUIT
[2019.04.04] 07:31:13 [123.123.123.123][22599567] disconnected at 4/4/2019 7:31:13 AM