Oversea Site via xmail wrote on 05/26/2015 03:09 PM:
Now I am using original XMAIL-1.27.tar.gz source without simultaneous POP3
logins, no STUNNEL, use NATIVE XMAIL SSL. The problem still exists, K9-MAIL
will report IllegalFormatConversonException when I receive more then
100-200 emails. So It should be XMAIL SSL problem. Because When I reuse
STUNNEL to do a POP3 tunnel again, the problem will fix.


But since you said that no error happens with normal mail-clients
(Outlook etc.), then the error must lie in the mobile clients you listed.
They seem to not handle properly the closing of the sockets they create.

cu
Uenal


---- Original Message ---- From: Bart Mortelmans <b...@bim.be> To:
t...@os.st, "XMail Users Mailing List" <xmail@xmailserver.org> Sent: Tue,
May 26, 2015, 3:13 PM Subject: Re: [xmail] BUG : XMAIL 1.27 with SSL

Is there any way for you to test if the problem exists if you don't allow
simultaneous POP3 logins?


Oversea Site via xmail schreef op 26/05/15 om 08:14:
POP3Utils.cpp - ADD POP3 Concurrent Login. I used this function over 5
years.. I don't know C++ programming. Sorry :)
====================================================================================================================



}
if (pPOPMD->ulFlags & POPF_MSG_DELETED) { UPopSendErrorResponse(hBSock,
ERR_MSG_DELETED, pPOPSD->iTimeout);

ErrSetErrorCode(ERR_MSG_DELETED); return ERR_MSG_DELETED; }

UsrGetMailboxPath(pPOPSD->pUI, szMsgFilePath, sizeof(szMsgFilePath),
1); StrNCat(szMsgFilePath, pPOPMD->szMsgName, sizeof(szMsgFilePath));
/* * ADDED CODE START */

FILE *pMsgFile = fopen(szMsgFilePath, "rb"); if (pMsgFile == NULL) {
UPopSendErrorResponse(hBSock, ERR_FILE_OPEN, pPOPSD->iTimeout);

ErrSetErrorCode(ERR_FILE_OPEN); return ERR_FILE_OPEN; }
fclose(pMsgFile);

/* * ADDED CODE END */

SysSNPrintf(szResponse, sizeof(szResponse) - 1, "+OK " SYS_OFFT_FMT "
bytes", pPOPMD->llMsgSize); if (BSckSendString(hBSock, szResponse,
pPOPSD->iTimeout) < 0) return ErrGetErrorCode();

if (pPOPMD->llMsgSize > 0 &&


---- Original Message ---- From: Oversea Site via xmail
<xmail@xmailserver.org> To: "XMail Users Mailing List"
<xmail@xmailserver.org> Sent: Tue, May 26, 2015, 1:56 PM Subject: Re:
[xmail] BUG : XMAIL 1.27 with SSL

FEDORA 4 X86_64 GLIBC 2.3.6-3 (I can't upgrade it to the lastest
version.. Because I have a chiliasp 3.6.2 32-bit run ASP VBSCRIPT on
APACHE 1.3 32-bit software, it need GLIBC 2.3.x and Kernel 2.6)

KERNEL 3.3 MOD FROM FC15 (It will display KERNEL 2.6.43 Number).
Kernel is not a main problem. Because I have been test 2.6.32 or
other. same problem was found.

REAL HARDWARE -> INTEL B85M i3-4150 16G RAM SATA3 RAID 1 LINUX
SOFTRAID1 MDADM

Corp. Email System is not heavily use when I test it in HK TIME
midnight..

Anyway I will test this issue in other linux distribution in VM, such
as CentOS. (You can give me any linux distribution, let's build the
same platform in VM. I use virtualbox.

[root@bravo logs]# uname -a Linux bravo 2.6.43-gcc402 #3 SMP Sun May
17 23:10:29 HKT 2015 x86_64 x86_64 x86_64 GNU/Linux [root@bravo
logs]# [root@bravo logs]# ldd /var/MailRoot/bin/XMail127v3
linux-vdso.so.1 =>  (0x00007ffff7f0e000) libssl.so.0.9.8 =>
/usr/local/ssl/lib/libssl.so.0.9.8 (0x00007f43b00bc000)
libcrypto.so.0.9.8 => /usr/local/ssl/lib/libcrypto.so.0.9.8
(0x00007f43afd35000) libdl.so.2 => /lib64/libdl.so.2
(0x0000003e18200000) libpthread.so.0 => /lib64/libpthread.so.0
(0x0000003e18600000) libstdc++.so.6 => /usr/lib64/libstdc++.so.6
(0x00007f43afa37000) libm.so.6 => /lib64/libm.so.6
(0x0000003e18000000) libgcc_s.so.1 => /lib64/libgcc_s.so.1
(0x0000003e19400000) libc.so.6 => /lib64/libc.so.6
(0x0000003e17d00000) /lib64/ld-linux-x86-64.so.2
(0x0000003e17b00000)

*******************************************************************
/var/MailRoot/bin/XMail127v3 -Md -Ms /var/MailRoot -Sl -Pl -Cl \ -SI
0.0.0.0:8025 -SI 0.0.0.0:25 \ -PI 0.0.0.0:8110 -PI 0.0.0.0:110 \ -BI
0.0.0.0:995 \ -XI 0.0.0.0:465 \ -Ql -Ln 256 -Pt 60 -St 150 -F- -SX
2048 -Mx 64 \ -Qn 64 -PX 2048 -Qr 10000 -Qt 1 -QT 150 -Qg -CX 256
*******************************************************************

---- Original Message ---- From: "U.Mutlu" <um4...@mutluit.com> To:
t...@os.st, "XMail Users Mailing List" <xmail@xmailserver.org> Sent:
Tue, May 26, 2015, 1:06 PM Subject: Re: [xmail] BUG : XMAIL 1.27
with SSL

Oversea Site via xmail wrote on 05/26/2015 05:14 AM:
No Log Error. No Fatal Error log. No Core Dump

It's not RAM or HW problem. It's XMAIL internal issue, because
when I switch to stunnel, all problems solved. And then when I
test K9-MAIL with XMAIL+STUNNEL, K9 Client will not have any JAVA
somethings Exception Error

Two tests

1. Very Important Thing in Xmail 1.27 Native SSL

If the emailbox has many emails such as 10000, Microsoft Outlook
with SSL or NON-SSL download them, it WILL NOT have this issue.
Some Tencent Foxmail for Windows, after finish ssl session, it
will take the server be FIN_WAIT2 (some version, not all) But
K9-MAIL for Android, Download first 1000, it will appear the
error in K9-MAIL randomly.


2. Xmail 1.27 + Stunnel Proxy

If the emailbox has many emails such as 10000, Microsoft Outlook
with SSL or NON-SSL download them, it WILL NOT have this issue.
Some Tencent Foxmail for Windows, after finish ssl session, it
WILL NOT have any problem. Server WILL NOT TAKE FIN_WAIT_2
K9-MAIL for Android, Download first 1000, it will NOT DISPLAY any
error when it finished download emails.
I would need full description about the server HW and SW (OS
version, xmail start params etc., any xmail patches applied etc.).

There is of course also the possibility that the bug lies in the
said mobile client program, especially if it goes online via
unstable mobile links as it seems to be a link latency problem, or
the client does not close the socket cleanly. Take a look at
these: https://github.com/Automattic/socket.io/issues/1380
http://stackoverflow.com/questions/5328155/preventing-fin-wait2-when-closing-socket



cu
Uenal


---- Original Message ---- From: "U.Mutlu"
<um4...@mutluit.com> To: t...@os.st, "XMail Users Mailing List"
<xmail@xmailserver.org> Sent: Tue, May 26, 2015, 10:11 AM
Subject: Re: [xmail] BUG : XMAIL 1.27 with SSL

Oversea Site via xmail wrote on 05/25/2015 09:23 PM:
I found the bug on XMAIL 1.27 with SSL (POP3S is main), SSMTP
service maybe has a same bug too

1. it will have too many FIN_WAIT_2 on POP3S with two many
requests, It is because of some non-popular WINDOWS CLIENT
e.g. tencent foxmail , outlook will not have this issue.

2. If you're using XMAIL'S internal SSL POP3S with any
openssl lib. (tested 0.9.8za 1.0.0, tested gcc
4.0.2/4.0.4/4.3.6) and the email account contain too many
emails (1000-2000 emails), the mobile client POP3 such as
Samsung internal Email Client is using SSL, K9-MAIL on any
android devices using SSL, some iPhone devices (connect with
XMAIL SSL port 995), will not download them successfully
(Android Error - Java Exception Error) and some iPhone device
will stuck with it, it will not download all emails
successfully. But if you disable XMAIL'S internal POP3S with
-B- startup option, and switch stunnel 5.17 port 995 tunnel
to port 110, it will solve this problem and kick out
FIN_WAIT_2

***** stunnel 5.17 config ***** [pop3s] accept  = 995 connect
= 110 cert = /etc/stunnel/stunnel.pem
***************************

What do the logs (server, client) say about the errors?

I think you need a faster server HW and/or need to optimize the
resources, for example the number of threads, and possibly also
RAM. An excerpt from the doc: " If you have an heavily loaded
server remember to setup the best number of XMAIL threads by
specifying the '-Qn nthreads' option (you must do some
tentatives to find the best value for your needs). Also you can
limit the number of SMTP, POP3 and CTRL service threads by
specifying the options '-SX maxthreads', '-PX maxthreads' and
'-CX maxthreads'. "

If there are mail filters, you can put them into a ramdisk and
set PATH accordingly, or use an absolute path to them. See also
XMAIL_TEMP in the doc.

In task manager / system monitor you can see how the resource
usage is, especially CPU, memory, and network.

-- cu Uenal
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