[Users] [Bug 3803] New: Can't send letters larger than 10kb via IMAP without SSL/TLS

[noreply at thewildbeast.co.uk]

http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3803

            Bug ID: 3803
           Summary: Can't send letters larger than 10kb via IMAP without
                    SSL/TLS
    Classification: Unclassified
           Product: Claws Mail (Windows)
           Version: 3.15.0
          Hardware: PC
                OS: Windows 7
            Status: NEW
          Severity: normal
          Priority: P3
         Component: default
          Assignee: users at lists.claws-mail.org
          Reporter: nalimov at fintech.ru

I'm using opensource mail server hmailserver and Claws Mail client connected
via IMAP.
In case I do not use SSL / TLS, I encounter the following bug:
When I try to send a letter larger than ~10 kilobytes (no matter, with an
attachment or just with a long text), Claws Mail gives me the following
message:

Error: Could not queue message for sending.

Claws-Mail Network Log:
* Account 'accountname': Connecting to IMAP server: server.name:143...
[12:13:10] IMAP< * OK IMAPrev1 
* IMAP connection is un-authenticated
[12:13:11] IMAP> 1 CAPABILITY 
[12:13:11] IMAP< * CAPABILITY IMAP4 IMAP4rev1 CHILDREN IDLE QUOTA SORT ACL
NAMESPACE RIGHTS=texk 
[12:13:11] IMAP< 1 OK CAPABILITY completed 
[12:13:11] IMAP> Logging accountname at domain.name to server.name using plaintext
[12:13:11] IMAP< LOGIN completed
[12:13:11] IMAP< Login to server.name successful
[12:13:11] IMAP> 3 LIST "" "" 
[12:13:11] IMAP< * LIST (\Noselect) "\\" "" 
[12:13:11] IMAP< 3 OK LIST completed 
[12:13:11] IMAP> 4 SELECT Queue 
[12:13:11] IMAP< * 0 EXISTS 
[12:13:11] IMAP< * 0 RECENT 
[12:13:11] IMAP< * FLAGS (\Deleted \Seen \Draft \Answered \Flagged) 
[12:13:11] IMAP< * OK [UIDVALIDITY 1489512006] current uidvalidity 
[12:13:11] IMAP< * OK [UIDNEXT 16] next uid 
[12:13:11] IMAP< * OK [PERMANENTFLAGS (\Deleted \Seen \Draft \Answered
\Flagged)] limited 
[12:13:11] IMAP< 4 OK [READ-WRITE] SELECT completed 
[12:13:11] IMAP- [fetching UIDs...]
[12:13:11] IMAP> 5 UID FETCH 1:* (UID) 
[12:13:11] IMAP< 5 OK UID completed 
[12:13:11] IMAP> 6 APPEND Queue (\Seen) {29003} 
[12:13:11] IMAP< + Ready for literal data 
[12:13:11] IMAP> [data - 8166 bytes]
[12:13:11] IMAP> [data - 8190 bytes]
[12:13:11] IMAP> [data - 8190 bytes]
** IMAP error on server.name: stream error
** IMAP connection broken

hMailServer log:
"DEBUG"    3060    "2017-04-04 12:21:45.733"    "The read operation failed.
Bytes transferred: 0 Remote IP: ip_address, Session: 252, Code: 2, Message: End
of file"
"DEBUG"    3060    "2017-04-04 12:21:45.733"    "Ending session 252"

When I try to save a message as a draft, Claws Mail gives me the following
message:

Error: could not save draft.

Network Log:
[12:23:03] IMAP> 6 APPEND Drafts (\Seen) {28938} 
[12:23:03] IMAP< + Ready for literal data 
[12:23:03] IMAP> [data - 8179 bytes]
[12:23:03] IMAP> [data - 8190 bytes]
[12:23:03] IMAP> [data - 8190 bytes]
** IMAP error on server.name: stream error
** IMAP connection broken

BUT! If I use SSL/TLS connection, the message is sent or saved as a draft
without errors.

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