How come my mail won't send when I'm on a different network?

Discussion in 'Mac Basics and Help' started by Jay42, Sep 4, 2007.

  1. Jay42 macrumors 65816


    Jul 14, 2005
    This is probably (hopefully) a simple question. I configured Apple mail to work with my gmail and comcast accounts, which works great when I am at home. But if I go other places, like to a friends house or a different wifi network, the mail bounces back when I try to send it and I get a message like this. Is there a configuration I can change so this won't happen?

    Attached Files:

  2. mad jew Moderator emeritus

    mad jew

    Apr 3, 2004
    Adelaide, Australia
    To keep an eye on possible spammers from their own network, some ISPs will not let you send mail through anything other than their own SMTP address. The best workaround is to either try using port 587 instead, or to use the ISP's own SMTP address.
  3. AlBDamned macrumors 68030


    Mar 14, 2005
    You probably need a different outgoing mail server. So instead of comcast, it could be
  4. Nugget macrumors 68000


    Nov 24, 2002
    Houston Texas USA
    mad jew is correct, the proper solution is to use a port other than port 25. That is, assuming your ISP offers SMTP relay services on an alternative port. The submission port (587) is what is most commonly used for this purpose, but sometimes you might find it on the ssmtp port (465) or even some totally off-the-wall port like 8025.

    Try those and if none of them work, call Comcast and ask if they have any suggestions.
  5. skybolt macrumors 6502a

    Feb 20, 2005
    Nashville, TN, USA
    When I travel and have this problem, I just switch to the gmail server and mail goes just fine. Could work for you!
  6. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    One caveat is that a lot of the ISP SMTPs (not sure about Comcast) don't allow for authentication or external access to their SMTPs (except maybe for their own accounts?). This complicates things because, if you're using the comcast SMTP right now, it may not work when you're elsewhere to switch it to port 587. The GMail one should work fine. I think, but I'm not sure, that if you set it up so that GMail uses Google's SMTP on 587, and Comcast uses Comcast's SMTP on 587, you'll be good.

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