https://bugs.kde.org/show_bug.cgi?id=440343
--- Comment #1 from Aaron Williams ---
Update, this was due to Akonadi not handling a very long CC list properly. The
server thought it received a "CC" command and failed. I have the entire log
entry, but I do not want to attach it here for obvious reasons.
Here's the IMAP log entry:
C: A05 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID
UNSELECT CLIENTACCESSRULES CLIENTNETWORKPRESENCELOCATION BACKENDAUTHENTICATE
CHILDREN IDLE NAMESPACE LITERAL+
S: A05 OK CAPABILITY completed.
C: A06 NAMESPACE
S: * NAMESPACE ( ("" "/") ) ( ) ( )
S: A06 OK NAMESPACE completed.
C: A07 ID ("name" "Kontact IMAP Resource")
S: * ID ( name Microsoft.Exchange.Imap4.Imap4Server version 15.20 )
S: A07 OK ID completed
C: A08 APPEND "INBOX" "27-Jul-2021 14:58:48 +" {110937}
S: + Ready for additional command text.
C: Received: from DM5PR1801MB1898.namprd18.prod.outlook.com
(2603:10b6:4:6c::35) by BYAPR18MB2469.namprd18.prod.outlook.com with HTTPS;
Tue, 27 Jul 2021 14:59:39 +
Received: from CO2PR04CA0074.namprd04.prod.outlook.com (2603:10b6:102:1::42) by
DM5PR1801MB1898.namprd18.prod.outlook.com (2603:10b6:4:6c::35) with Microsoft
SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
15.20.4352.29; Tue, 27 Jul 2021 14:59:30 +
Received: from MW2NAM04FT047.eop-NAM04.prod.protection.outlook.com
(2603:10b6:102:1:cafe::2c) by CO2PR04CA0074.outlook.office365.com
(2603:10b6:102:1::42) with Microsoft SMTP Server (version=TLS1_2,
cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4308.20 via Frontend
Transport; Tue, 27 Jul 2021 14:59:30 +
...
S: Cc: BAD Command Error. 10
X
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