Playing dice with smtp package
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From: drscrypt on 7 Jul 2010 14:39 On 7/7/2010 2:16 PM, Craig wrote: > MTU, Maximum Tranmission Unit, is the largest message size for a chunk > of data for a protocol. larger messages get broken up into chunks <= > MTU. I think Uwe is suggesting that if the MTU (possibly on the MTA's > side) were assumed to be different sizes in different places, then > messages above a certain size might be getting trashed. > > craig I see. Yes, the message size definitely seems to be a factor. All else being equal, increasing the message size makes the sendmessage to fail. I don't have the opportunity now to run automated tests and create plots. In the original thread, there are references to the size boundaries being equal to the blocksize parameter. I don't know MTA's or MTU's or even how to modify them. The same script has worked for a long time and the only change was a recent upgrade to tcllib1.12 along with ActiveTcl 8.4.19. DrS
From: Robert Heller on 7 Jul 2010 14:55
At Wed, 07 Jul 2010 12:55:57 -0400 drscrypt(a)gmail.com wrote: > > On 7/7/2010 12:36 PM, Gerald W. Lester wrote: > > Your reports have been the first against smtp in *years*. > > I don't know if everyone reports it or whether they specifically say > smtp. But with a simple google search, here is one from April: > > http://groups.google.com/group/comp.lang.tcl/browse_frm/thread/5d560e747f81f3cd/0261df82f0c16eac?lnk=gst&q=smtp#0261df82f0c16eac > > Another one from 2008: > http://groups.google.com/group/comp.lang.tcl/msg/4a39aee713c539fe > > > Here is another that acknowledges a similar issue, for whom it was > resolved by removing Trf: > > http://groups.google.com/group/comp.lang.tcl/msg/ae5c1120d1593af4 > > > So I am sure there are others too; not counting the wiki. > > > > > When your initial report came in, I verified (using gmail.com and > > cox.net) that I could send a fairly large attachments using 8.5 and 8.6. > > I am using 8.4. Can you run the same tests again with a recent version > of Tcl 8.4.x and Tcllib 1.12? What script are you using? > > > > As Uwe Klein suggest, in this thread and several of us in your previous > > thread, try against another MTA -- I think several of us suspect the > > fault lies in the MTA or your connection. > > > > Well, when I send a small attachment of a few hundred bytes, all is OK. > When the attachment size grows, problems start. I am on a pretty fast > connection so it is not an issue. My MTA is yahoo. I don't have > another MTA at the moment. Are you saying it is not working with yahoo? All you really need for testing against another MTA is a random Linux machine with Sendmail or something installed on it. For testing purposes, it does not even need to be on the public Internet. > > > DrS > -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/ |