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e-mail attachments
I am not able to send attachments by e-mail; I can receive them.
I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken |
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I have checked with my ISP (Earthlink), and he finds no problems with that
particular server. I use a pop server for incoming and smtp for outgoing. Ken Fawad Chughtai wrote: Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken |
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In article , KenTak
wrote: --------------000103090006090801000506 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I have checked with my ISP (Earthlink), and he finds no problems with that particular server. I use a pop server for incoming and smtp for outgoing. Ken My ISP made a change to our mail server, where ICMP was disabled (so for example you cannot ping the server) and the MTU was changed to a value which happened to be 10 or 20 bytes less than the MTU of my router. This places the mail server in what I think is termed a "black hole". What happens is, when you send a large email, the email program sends full sized packets. Normally, TCP/IP would "discover" the MTU of the destination, using a function supported by ICMP. Something to do with whether to fragment the packet or not. Unfortunately, the protocol is such, that a server operating in a black hole, returns nothing to the sender, and the protocol freezes, because there is no retry by your computer. When I phoned tech support at my ISP, they were all sweet and innocent, explaining it was my fault that my MTU was too big, and would I reduce it. They didn't explain the change they made, which is normally implemented as some kind of protection against security or denial of service attacks on the mail server. Now that I've reduced my MTU, everything is back to normal. I hope tech support at Earthlink are more honest about what they have done with their server. It is quite possible the lowest tier individuals who answer the phone, know nothing of the details. HTH, Paul Fawad Chughtai wrote: Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken --------------000103090006090801000506 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" html head meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" title/title /head body I have checked with my ISP (Earthlink), and he finds no problems with that br particular server.br I use a pop server for incoming and smtp for outgoing.br Kenbr br Fawad Chughtai wrote:br blockquote type="cite" " pre wrap=""Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: /pre blockquote type="cite" pre wrap=""I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken /pre /blockquote pre wrap=""!---- /pre /blockquote br /body /html --------------000103090006090801000506-- |
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Thanks for your reply.
What is the MTU and how do I change it? Ken Paul wrote: In article , KenTak wrote: --------------000103090006090801000506 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I have checked with my ISP (Earthlink), and he finds no problems with that particular server. I use a pop server for incoming and smtp for outgoing. Ken My ISP made a change to our mail server, where ICMP was disabled (so for example you cannot ping the server) and the MTU was changed to a value which happened to be 10 or 20 bytes less than the MTU of my router. This places the mail server in what I think is termed a "black hole". What happens is, when you send a large email, the email program sends full sized packets. Normally, TCP/IP would "discover" the MTU of the destination, using a function supported by ICMP. Something to do with whether to fragment the packet or not. Unfortunately, the protocol is such, that a server operating in a black hole, returns nothing to the sender, and the protocol freezes, because there is no retry by your computer. When I phoned tech support at my ISP, they were all sweet and innocent, explaining it was my fault that my MTU was too big, and would I reduce it. They didn't explain the change they made, which is normally implemented as some kind of protection against security or denial of service attacks on the mail server. Now that I've reduced my MTU, everything is back to normal. I hope tech support at Earthlink are more honest about what they have done with their server. It is quite possible the lowest tier individuals who answer the phone, know nothing of the details. HTH, Paul Fawad Chughtai wrote: Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken --------------000103090006090801000506 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" html head meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" title/title /head body I have checked with my ISP (Earthlink), and he finds no problems with that br particular server.br I use a pop server for incoming and smtp for outgoing.br Kenbr br Fawad Chughtai wrote:br blockquote type="cite" " pre wrap=""Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: /pre blockquote type="cite" pre wrap=""I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken /pre /blockquote pre wrap=""!---- /pre /blockquote br /body /html --------------000103090006090801000506-- |
#5
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You might also try and go to www.dslreports.com
They have some "tools" to help you check/adjust the MTU as well as RWIN (early versions of Windoze set the latter to ~8192 and thus would limit throughput on broadband to around 700kbps instead of ~1500kbps---when considering average network latency). Paul "Paul" wrote in message ... In article , KenTak wrote: --------------050901050503050000080904 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Thanks for your reply. What is the MTU and how do I change it? Ken MTU is Maximum Transfer Unit. Each piece of media in the path to an internet site has a MTU, but a packet can only get through if it is smaller than the least MTU in the path. PMTU, is the path MTU discovery process, and it is the part of the protocol that finds what size to use. A "black hole" prevents PMTU from working. A normal value for MTU for Ethernet might be 1500 bytes. There are several approaches to making the adjustment. You can adjust the MTU on your router. You can also change registry settings in Windows to do it (Depending on which Microsoft OS you use, the registry entry could be "MTU" or "MaxMTU"). Or, there are shareware/freeware programs that will edit the registry for you (easymtu ? MTU-Speed Pro ? etc). Searching on "mtu adjust windows" at Altavista, leads me to this Cisco doc. It has references to various Knowledgebase articles. The last page mentions a registry setting for WinXP: http://www.cisco.com/warp/public/105/38.pdf http://support.microsoft.com/default...b;en-us;314053 (see "MTU") But I would call Earthlink, and get them to either walk you through the registry editing process, or give you an application to set it up. It will give you a chance to have them admit they created the problem in the first place. They should also be able to give you a new value for MTU, because otherwise you would have to guess at it and test each time. Paul Paul wrote: In article , KenTak wrote: --------------000103090006090801000506 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I have checked with my ISP (Earthlink), and he finds no problems with that particular server. I use a pop server for incoming and smtp for outgoing. Ken My ISP made a change to our mail server, where ICMP was disabled (so for example you cannot ping the server) and the MTU was changed to a value which happened to be 10 or 20 bytes less than the MTU of my router. This places the mail server in what I think is termed a "black hole". What happens is, when you send a large email, the email program sends full sized packets. Normally, TCP/IP would "discover" the MTU of the destination, using a function supported by ICMP. Something to do with whether to fragment the packet or not. Unfortunately, the protocol is such, that a server operating in a black hole, returns nothing to the sender, and the protocol freezes, because there is no retry by your computer. When I phoned tech support at my ISP, they were all sweet and innocent, explaining it was my fault that my MTU was too big, and would I reduce it. They didn't explain the change they made, which is normally implemented as some kind of protection against security or denial of service attacks on the mail server. Now that I've reduced my MTU, everything is back to normal. I hope tech support at Earthlink are more honest about what they have done with their server. It is quite possible the lowest tier individuals who answer the phone, know nothing of the details. HTH, Paul Fawad Chughtai wrote: Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken --------------000103090006090801000506 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" html head meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1" title/title /head body I have checked with my ISP (Earthlink), and he finds no problems with that br particular server.br I use a pop server for incoming and smtp for outgoing.br Kenbr br Fawad Chughtai wrote:br blockquote type="cite" " pre wrap=""Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: /pre blockquote type="cite" pre wrap=""I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken /pre /blockquote pre wrap=""!---- /pre /blockquote br /body /html --------------000103090006090801000506-- --------------050901050503050000080904 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit !DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" html head title/title /head body Thanks for your reply. br What is the MTU and how do I change it?br Kenbr br Paul wrote:br blockquote type="cite" " pre wrap=""In article a class="moz-txt-link-rfc2396E" "<3 & gt;/a, KenTak a class="moz-txt-link-rfc2396E" "<kentake@ea rthlink.net>/a wrote: /pre blockquote type="cite" pre wrap=""--------------000103090006090801000506 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I have checked with my ISP (Earthlink), and he finds no problems with that particular server. I use a pop server for incoming and smtp for outgoing. Ken /pre /blockquote pre wrap=""!---- My ISP made a change to our mail server, where ICMP was disabled (so for example you cannot ping the server) and the MTU was changed to a value which happened to be 10 or 20 bytes less than the MTU of my router. This places the mail server in what I think is termed a "black hole". What happens is, when you send a large email, the email program sends full sized packets. Normally, TCP/IP would "discover" the MTU of the destination, using a function supported by ICMP. Something to do with whether to fragment the packet or not. Unfortunately, the protocol is such, that a server operating in a black hole, returns nothing to the sender, and the protocol freezes, because there is no retry by your computer. When I phoned tech support at my ISP, they were all sweet and innocent, explaining it was my fault that my MTU was too big, and would I reduce it. They didn't explain the change they made, which is normally implemented as some kind of protection against security or denial of service attacks on the mail server. Now that I've reduced my MTU, everything is back to normal. I hope tech support at Earthlink are more honest about what they have done with their server. It is quite possible the lowest tier individuals who answer the phone, know nothing of the details. HTH, Paul /pre blockquote type="cite" pre wrap=""Fawad Chughtai wrote: /pre blockquote type="cite" pre wrap=""Maybe there is a problem with your mail server, and not your computer? So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: /pre blockquote type="cite" pre wrap=""I am not able to send attachments by e-mail; I can receive them. I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken /pre /blockquote pre wrap="" /pre /blockquote pre wrap="" --------------000103090006090801000506 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"> <title></title> </head> <body> I have checked with my ISP (Earthlink), and he finds no problems with that <br> particular server.<br> I use a pop server for incoming and smtp for outgoing.<br> Ken<br> <br> Fawad Chughtai wrote:<br> <blockquote type="cite" cite=a class="moz-txt-link-rfc2396E" "/a> ; <pre wrap="">Maybe there is a problem with your mail server, and not /pre /blockquote pre wrap=""!----your computer? /pre blockquote type="cite" pre wrap=""So you are using a pop server to send email? -Fawad On Fri, 27 Jun 2003, KenTak wrote: </pre> <blockquote type="cite"> <pre wrap="">I am not able to send attachments by e-mail; I can /pre /blockquote pre wrap=""!----receive them. /pre blockquote type="cite" pre wrap=""I have P4PE with XP Pro installed; firewall disabled. I've tried Netscape 7.02, Mozilla 1.3, and Outlook 98; none have been able to send attachments. I've tried small and large files. Thanks for any help Ken </pre> </blockquote> <pre wrap=""><!----> </pre> </blockquote> <br> </body> </html> --------------000103090006090801000506-- /pre /blockquote /blockquote br /body /html --------------050901050503050000080904-- |
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