I am trying to send a message to Office 365 via IMAP (using my own software). What I am seeing is, if the message is over a certain size (10240 bytes, to be exact) the server will fail to the APPEND command like this:
Delivered-To: BAD Command Error. 10
The server name is "outlook.office365.com". Using SSL on port 993.
The "Delivered-To:" happens to be the first line of the message (although there is additional text after that, it does not show up in the error message). For some reason it thinks that the first line of data is a command, instead of message text. If the total length of the message is less than 10240, then it works just fine (with the exact same data, just cutoff at the end). For example, here is the first part of the trace, where it fails:
<send 67>A009 APPEND "Migrated/INBOX" "08-May-2013 13:38:56 -0800" {21748}<recv 38>+ Ready for additional command text.<send 21748>Delivered-To: jmckay9351@gmail.com
Received: by 10.194.162.225 with SMTP id yd1csp6294wjb;
Wed, 8 May 2013 08:38:58 -0700 (PDT)(the <send> and <recv> strings are not part of the data, just info from the trace). Here is a trace where it works:
<send 67>A009 APPEND "Migrated/INBOX" "08-May-2013 13:38:56 -0800" {8000}<recv 38>+ Ready for additional command text.<send 8000>Delivered-To: jmckay9351@gmail.com
Received: by 10.194.162.225 with SMTP id yd1csp6294wjb;
Wed, 8 May 2013 08:38:58 -0700 (PDT)In this case, I have arbitrarily cut off the data at 8000 bytes. The APPEND command works fine.
By the way, this exact same code/data works fine with every other IMAP server I have tried. Any ideas?