Hi all,
I am using NGINX as a mailproxy and recently discovered, that wireshark detects
IMAP-LOGIN messages sent by nginx as "Malformed".
The message contains: Line: 3 LOGIN {18}\r\n (HEX: 0000 33 20 4c 4f 47 49 4e
20 7b 31 38 7d 0d 0a)
Some imap servers react to this with "BAD UNKNOWN Command" and close the
connection.
Here the full communication between nginx and backend:
3 LOGIN {18}
+ go ahead
<redacted user> {9}
+ go ahead
<redacted pass>
3 OK LOGIN completed
4 CAPABILITY
BAD UNKNOWN Command
any ideas?
best regards
Fabian
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