dovecot lda deliver_log_format question

[rudolf at padaru.de]

Hey,

 

i have an question about the deliver_log_format.

 

My log looks sometimes like:  

Oct 1 09:38:01 dd44414 dovecot: lda(user)<20009><9MYzGVmHdV8pTgAA+v7NQw>:
msgid=<20201001073801.628713AC05DC at myserver.com>: saved mail to INBOX

 

The deliver_log_format settings are still on default. Are somebody able to
explain me this part of the log message? <20009><9MYzGVmHdV8pTgAA+v7NQw>: 

 

What want dovecot to say with this?

 

Mit freundlichen Grüßen

Yours sincerely

 

Pascal Rudolf

 

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