Outlook 2007 slow throughput for attachments


  1. Posts : 529
    windows 8.1 Pro x64
       #1

    Outlook 2007 slow throughput for attachments


    Ok so is no confusion the issue isnt a slow connection to the mail server or slow to submit email it is a low throughput. Since normal emails are tiny they go fast but if I eg. send a 1meg file over smtp email it is slower than eg. ftp.

    My connection is 20mbit upload so approx 2.4mbytes upload so no confusion.

    So my web server which I manage is my primary email server, it also has ftp as a transfer protocol. As well as a webmail interface.

    If I upload the file to the ftp it uses all my upstream bandwidth.
    If I send an email with the file as an attachment using webmail it uploads and is sent in under a second.
    If I send the email via smtp using outlook it sends at around 200kB/sec.

    The following all have no affect on the speed other than stated.

    Disabling a/v
    Changing the smtp port.
    Disabling tls/ssl.
    Enabling ctcp increases the speed to 250kB/sec, which is still hideous barely over 10% of my possible speed.

    I havent tried another email client such as outlook express or thunderbird, or outlook 2010.

    I suspect the issue is that outlook is hardcoded to a small tcp send buffer as a typical end user doesnt have a fast upload connection when outlook 2007 was developed. If so is there a way to tune it higher (or is it really hardcoded non tunable) or is there other ideas to speed it up.
      My Computer


  2. Posts : 427
    Windows 7 Home Premium 64 Bit
       #2

    Have you checked outlook for any possible addins? Your anti virus may have added a plugin.

    As a test, open outlook in safe mode, (not windows safe mode )
    Send a test and track its speed.

    Your outgoing smtp is your broadband providers right ?
      My Computer


  3. Posts : 529
    windows 8.1 Pro x64
    Thread Starter
       #3

    the anti virus does have an addin but its been disabled for testing.

    the smtp server is my own smtp server I personally manage not my broadband isp.

    Since I still havent got this resolved, I will try thunderbird as well as a newer outlook to see if they have the same issue. As I still believe its due to a hardcoded low send buffer value.
      My Computer


 

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