Maybe it has something to do with *some* specific sender/receiver client software? I have received all your e-mails only once! Maybe your mail client adds some strange header that confuses the mail client of your mailserver-users and John Kielkopf? I'm using Microsoft Outlook Express 6.
I recommend to: 1. Find out when it happens (does it depend on the receiver/sender address/software/IP/...) 2. Use a packet monitor (for example Ethereal, which is now called WireShark) 3. Try to send a message that will arrive twice (using what you found in step 1) Ivo ----- Original Message ----- From: "Aaron Fransen" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, March 22, 2007 1:42 PM Subject: [xmail] Re: Receiving Mail multiple times >I sure didn't mean to send it 4 times, but it seems like the exact > problem I'm talking about! > > I can see where the quit/delete sequence might be causing a problem so > I'm going to rejigger the client app to see if that fixes the problem. > > The server is running on Windows 2003 (ugh) and there really isn't > much else running to interfere with it (MySQL, Apache are the only > other apps). > > Francis: You had mentioned you thought it might be connectivity, > however the web client app and the XMail server are running on the > same box... > > On 3/21/07, John Kielkopf <[email protected]> wrote: >> Davide can correct me if I'm wrong, but the POP3 server shouldn't delete >> the messages until after the QUIT command is sent. "Deleting" the >> message after each retrieval only queues the message for deletion at >> QUIT. >> If you're receiving the duplicates in the same POP3 session, then it >> rules out an early session termination as the cause. Are you positive >> this is the case? If so, how one single email message in a user's Xmail >> maildir can turn into duplicate messages in the same POP3 session is >> beyond me. >> >> What OS is your Xmail server running on? What other services are running >> on the server? Have you tried an older Xmail version? >> >> Also, you sent this message the list 4 times. Did you intend this? >> >> >> Aaron Fransen wrote: >> > I've had the issue both with local clients and remote clients running >> > over a very expensive MPLS network, and in all the scanning I've done >> > I can't see any issues with connectivity. >> > >> > File locking? Hm, it's possible, however there's no AV software >> > running on the server (not live, just batched once in a while and not >> > when these problems are happening). >> > >> > In terms of the sequence of events, the mail client I wrote (I can't >> > speak to how Outlook is having the same problem, but with my program I >> > can!) it fetches each email individually then sends the command to the >> > server to delete it, then processes the next message. Maybe I should >> > do it the other way? Process them all THEN go back and delete them? >> > >> > The duplicates happen right away too, not during the next POP3 >> > session; that is, as soon as the user clicks "Check Mail" he/she'll >> > get duplicates (or triplicates) of the incoming mail immediately >> > without waiting for the next check. >> > >> > On 3/21/07, John Kielkopf <[email protected]> wrote: >> > >> >> Things to check: >> >> 1) Thoroughly check network connectivity to the mail server from the >> >> problem clients. >> >> >> >> 2) Any possible file locking conflicts? Is there anything running on >> >> the server, possibly antivirus software, that might be locking the >> >> email >> >> in the server's mail directory? >> >> Thought of what could be happening here: >> >> a) Client retrieves all mail via pop3, marking them for deletion. >> >> b) Something on the mail server is still holding the files open >> >> for >> >> read (on demand AV scanner maybe?) >> >> c) Client quits the pop3 session, and the messages marked for >> >> deletion are now supposed to be deleted >> >> d) Because one of the email messages is locked for read (see: "b", >> >> above), Xmail is unable to delete files, and gives up. >> >> e) Mail has not been deleted, and will be re-downloaded on next >> >> pop3 >> >> session. >> >> >> >> >> >> Davide would be able to comment on the possibility of "2d" happening >> >> on >> >> Xmail. I have no idea if it could even happen, so I may be way off >> >> base >> >> here -- but short of a network connectivity issue, I can think of >> >> nothing else at the moment. >> >> >> >> >> >> Aaron Fransen wrote: >> >> >> >>> For some folks they receive emails twice, for some it's three times, >> >>> but not (that I've heard anyways) more than that. >> >>> >> >>> An example: Joe Smith comes back from holidays, and has 50 emails >> >>> sitting there for him. He receives each and every one three times >> >>> exactly, ending up with 150 new emails in his inbox. >> >>> >> >>> Jane Doe checks her email every morning, and most mornings ends up >> >>> receiving two of every email. >> >>> >> >>> Note that it's not selective: If a user is going to have this happen, >> >>> it's going to every single email they happen to be retrieving at the >> >>> time. If it's not going to happen, it's not going to happen on ANY of >> >>> the emails they are retrieving. >> >>> >> >>> Aaron >> >>> >> >>> >> >>> On 3/21/07, Hal Dell <[EMAIL PROTECTED]> wrote: >> >>> >> >>> >> >>>>> I've tracked this as much as I can and this is what I've found: At >> >>>>> no time >> >>>>> >> >>>>> >> >>>> do the messages >> >>>> >> >>>> >> >>>>> exist on the server twice...they are *only* received twice by the >> >>>>> client. >> >>>>> >> >>>>> It does seem to happen to some people more than others, which leads >> >>>>> me to >> >>>>> >> >>>>> >> >>>> believe >> >>>> >> >>>> >> >>>>> it's a "double-click the Send/Receive" button issue, but when I >> >>>>> test it >> >>>>> >> >>>>> >> >>>> the second request >> >>>> >> >>>> >> >>>>> is rejected since the POP server only allows a single connection >> >>>>> per >> >>>>> >> >>>>> >> >>>> individual. >> >>>> >> >>>> Are you sure they are *only* received the eMails twice? NOT more >> >>>> then that? >> >>>> >> >>>> Since, I'm coming into the middle of this eMail exchange in the -- I >> >>>> don't >> >>>> have >> >>>> all of the facts of your situation.... >> >>>> >> >>>> I had a problem like yours and was caused by the long time standing >> >>>> issues >> >>>> with >> >>>> mail clients on Windows due to the POP3 Tail issue - the symptoms >> >>>> that you >> >>>> state >> >>>> are nearly identical. David created a filter to not allow these >> >>>> messages in >> >>>> the queue. >> >>>> If you don't already have the filter installed I would highly >> >>>> recommend >> >>>> installing it. >> >>>> (Someone on this list may be able to tell the location to download >> >>>> the >> >>>> filter -- I >> >>>> don't see it listed on xmailserver.org -- it was mailed around at >> >>>> the time). >> >>>> >> >>>> POP3 Tail issue is caused by spam and other hacker attempts at DOS >> >>>> targeted >> >>>> at the eMail clients by intentionally corrupting the normal double >> >>>> CR LF at >> >>>> the >> >>>> bottom of the eMail message byte stream. >> >>>> >> >>>> An eMail that is corrupted in this way causes the email client to >> >>>> never >> >>>> complete >> >>>> downloading the eMailbox the mailbox is never cleared and then you >> >>>> get >> >>>> your Emails over and over again. This is a safety mechanism in the >> >>>> client >> >>>> to prevent accidental erasure of eMail messages in the case of a >> >>>> dropped >> >>>> IP connection. >> >>>> >> >>>> I'm not sure this will help you... Let us know... >> >>>> >> >>>> >> >>>> Thanks, >> >>>> Hal Dell >> >>>> Managing Partner >> >>>> ePodWorks.net, Inc. >> >>>> PO Box 22 >> >>>> Willow Grove, PA 19090 >> >>>> +1-215-830-0662 (phone) >> >>>> +1-866-549-4652 (fax) >> >>>> Need Support send eMail to [EMAIL PROTECTED] ! >> >>>> >> >>>> >> >>>> - >> >>>> To unsubscribe from this list: send the line "unsubscribe xmail" in >> >>>> the body of a message to [EMAIL PROTECTED] >> >>>> For general help: send the line "help" in the body of a message to >> >>>> [EMAIL PROTECTED] >> >>>> >> >>>> >> >>>> >> >>>> >> >>> - >> >>> To unsubscribe from this list: send the line "unsubscribe xmail" in >> >>> the body of a message to [EMAIL PROTECTED] >> >>> For general help: send the line "help" in the body of a message to >> >>> [EMAIL PROTECTED] >> >>> >> >>> >> >>> >> >>> >> >> >> >> - >> >> To unsubscribe from this list: send the line "unsubscribe xmail" in >> >> the body of a message to [EMAIL PROTECTED] >> >> For general help: send the line "help" in the body of a message to >> >> [EMAIL PROTECTED] >> >> >> >> >> >> >> > - >> > To unsubscribe from this list: send the line "unsubscribe xmail" in >> > the body of a message to [EMAIL PROTECTED] >> > For general help: send the line "help" in the body of a message to >> > [EMAIL PROTECTED] >> > >> > >> > >> >> >> >> - >> To unsubscribe from this list: send the line "unsubscribe xmail" in >> the body of a message to [EMAIL PROTECTED] >> For general help: send the line "help" in the body of a message to >> [EMAIL PROTECTED] >> >> > - > To unsubscribe from this list: send the line "unsubscribe xmail" in > the body of a message to [EMAIL PROTECTED] > For general help: send the line "help" in the body of a message to > [EMAIL PROTECTED] > - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
