Syntax error in BODYSTRUCTURE. Unexpected token: '('

[HochzeitManagement]

Hey,
I am getting a issue with BODYSTRUCTURE parsing.

See similar error:
#1393
#777
#371

[MailKit.Net](http://mailkit.net/).Imap.ImapProtocolException HResult=0x80131500 Message=Syntax error in BODYSTRUCTURE. Unexpected token: '(' Source=MailKit StackTrace: at [MailKit.Net](http://mailkit.net/).Imap.ImapUtils.ReadNStringToken(ImapEngine engine, String format, Boolean rfc2047, CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapUtils.ParseBody(ImapEngine engine, String format, String path, CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapUtils.ParseMultipart(ImapEngine engine, String format, String path, CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapUtils.ParseBody(ImapEngine engine, String format, String path, CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapFolder.ParseSummaryItems(ImapEngine engine, MessageSummary message, FetchSummaryItemsCompletedCallback completed, CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapFolder.UntaggedFetchSummaryItemsHandler(ImapEngine engine, ImapCommand ic, Int32 index, Boolean doAsync) at [MailKit.Net](http://mailkit.net/).Imap.ImapEngine.ProcessUntaggedResponse(CancellationToken cancellationToken) at [MailKit.Net](http://mailkit.net/).Imap.ImapCommand.Step() at [MailKit.Net](http://mailkit.net/).Imap.ImapEngine.Iterate() at [MailKit.Net](http://mailkit.net/).Imap.ImapEngine.Run(ImapCommand ic) at [MailKit.Net](http://mailkit.net/).Imap.ImapFolder.Fetch(IList1 uids, IFetchRequest request, CancellationToken cancellationToken) at MailKit.IMailFolderExtensions.Fetch(IMailFolder folder, IList1 uids, MessageSummaryItems items, IEnumerable1 headers, CancellationToken cancellationToken) at Management.Services.MailboxSyncService.Synchronization.MailboxFolderSync.<SyncMails>d__1.MoveNext() in C:\Users\konta\Source\Repos\Hochzeit.Management-DEV\Source\Management.Services.MailboxSyncService\Synchronization\MailboxFolderSync.cs:line 188 This exception was originally thrown at this call stack: [External Code] Management.Services.MailboxSyncService.Synchronization.MailboxFolderSync.SyncMails(Management.Modules.Mailing.HmImapClient, System.Guid, System.Guid, MailKit.IMailFolder, System.Collections.Generic.List<Management.Services.MailboxSyncService.Models.ContactMappingModel>) in MailboxFolderSync.cs

Using .net Framework 4.6.1
Mailkit library: v4.3.0.962

imap.log

Any ideas, if this can be fixed, or maybe even message could be ignored somehow?
Thanks

[jstedfast]

Based on the exception, the issue is with parsing the BODYSTRUCTURE portion of the response.

Luckily, your log has only 1 FETCH response, so it means it has to be this:

BODYSTRUCTURE (("text" "html" ("charset" "utf-8") NIL NIL "base64" 38706 497 NIL NIL NIL ()) ("image" "jpeg" ("name" "image003.jpg") "<image003.jpg@01CD0772.E9574810>" "image003.jpg" "base64" 3446 NIL ("inline" ("filename" "image003.jpg" "size" "2782" "creation-date" "Thu, 22 Mar 2012 13:56:38 GMT" "modification-date" "Thu, 22 Mar 2012 13:56:38 GMT")) NIL ()) ("image" "jpeg" ("name" "image004.jpg") "<image004.jpg@01CD0772.E9574810>" "image004.jpg" "base64" 3446 NIL ("inline" ("filename" "image004.jpg" "size" "2782" "creation-date" "Thu, 22 Mar 2012 13:56:39 GMT" "modification-date" "Thu, 22 Mar 2012 13:56:39 GMT")) NIL ()) ("image" "jpeg" ("name" "image005.jpg") "<image005.jpg@01CD0772.E9574810>" "image005.jpg" "base64" 3232 NIL ("inline" ("filename" "image005.jpg" "size" "2625" "creation-date" "Thu, 22 Mar 2012 13:56:39 GMT" "modification-date" "Thu, 22 Mar 2012 13:56:39 GMT")) NIL ()) "related" ("boundary" "_004_7D3F5AE184118942976793FC500B8F4A402D17DB3PRD0702MB097eu_" "type" "text/html") NIL ("de-DE") NIL)

From just looking at it, I suspect the issue is the () parts. the IMAP protocol is a very LISP-like syntax and so anything in ()'s is a "list" of some type. Empty lists (at least in the IMAP specification), are generally required to be represented by a NIL instead of (), and that's probably why things are blowing up.

Any ideas, if this can be fixed, or maybe even message could be ignored somehow?

My initial assumption based on what I'm seeing in the log is that yes, this server bug can be worked around.

I'll work on a fix shortly.

[HochzeitManagement]

Thanks for your fast answer and help,
here are the hole imap.log, but yes, it was just 1 Fetch.

imap.log

[jstedfast]

To get even more specific, the issue is with

[HochzeitManagement]

Thanks for your awesome work. a 💕 Dinner for Two 💕 is on the way to you :D