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Cannot send attachments with emails after installing VOip adaptor router

I have just installed a NetCommV300 adaptor router with my existing NetComm NB5Plus4 modem. I now cannot send attachments with my emails. A message says,"Connection to mail server interupted" . NetComm advised me to play around with the MTU settings in themodem also the MTU enforcer but this does not fix the problem. Any ideas? Many thanks. Geoff.

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  • Silvertop Feb 07, 2008

    Thanks for speedy reply. Yes I have and also set MTU to various figures down to 1000 but the problem remains. I wondered whether it must be settings with my ISP. I have just connected to VOiP with great sucess.

  • Silvertop Feb 07, 2008

    Thanks for your advice. It's late here now. I will take action tomorow and let you know how I fare. Thanks so much. Cheers! Geoff.

  • Silvertop Feb 07, 2008

    Re my previous post. I neglected to say that when I send attachments through webmail all is OK and when I disconnect the V300 my email attachments go through my email client OK. Geoff


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Just would like to ask additional information pls, have you enabled NAT in the VOIP Router? MTU 1500 or something like that?

Appreciate if you can post back info.

Kind regards.

Posted on Feb 07, 2008

  • Louie  Role
    Louie Role Feb 07, 2008

    Hi again,

    Allow me pls to summarize (and please correct where possible):
    1. Your PC's Ethernet port is connected to LAN1 of NetCommV300. The WAN of the router is connected to the Ethernet port of NetComm NB5Plus4 whose ADSL is connected to a telephone line from your ISP;
    2. You have NAT enabled in the NetCommV300;
    3. You have tried various settings if MTU from 1000 to 1500;
    4. Both the modem and the router has DHCP capability and both are enabled/active;
    5. your ISP is;

    Things you can initially try:
    1. disable the DHCP in the modem and manually configure the router's WAN settings to IP Add, Subnet Mask, Default Gateway/Router
    2. Set your PC to use IP Add, Subnet Mask, Default Gateway

    Further, you may want to call your ISP and explain your concern. They have specific information about port settings and port forwarding. You can try asking which port are they using - normally it is 25, but there are ISP who uses 587 or 465 and/or anything else they can tell you with regards to your particular setup - regular DSL with VOIP. Sometimes there are special configurations (due to the added feature(s) of the VOIP.

    Hope this be of initial help/ideas. Pls post back any developments.

    Good luck.

  • Louie  Role
    Louie Role Feb 07, 2008


    From initial indications of your last post, it would seem that port 25 is blocked in your V300 or your email client(Outlook or Eudora pls?) needs to be configured.



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