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Mail not sending for ONLY MacBooks

299 Views 2 Replies Latest reply: Feb 17, 2013 7:25 PM by iToaster RSS
James Rothschild Level 1 Level 1 (55 points)
Currently Being Moderated
Feb 15, 2013 7:26 AM

Here is a strange one.


Mac OSX Snow Leopard Server.

Apple Mail app on clients.


Desktops, iPhone, iPad can send and reveive email from outside the network.

MacBooks                 cannot send and reveive email from outside the network.


All thoughts very welcome, thank you.


James R for GeoffC

All of them, Mac OS X (10.6.4), Some PC's too, forgive me please!...
  • MrHoffman Level 6 Level 6 (11,695 points)
    Currently Being Moderated
    Feb 15, 2013 8:09 AM (in response to James Rothschild)

    From the errant clients: use Connection Doctor ( > Window > Connection Doctor) to test the access.


    From the server: Review the mail server log activity around the time of the failures (SMTP server log, POP/IMAP server log, and — if nothing is showing up there — your gateway and any local or gateway firewall logs), perform the usual SMTP/ESMTP server and POP/IMAP server settings comparisons, get off of port TCP 25 for submitting mail from clients, and stay out of and if any VPNs are in use.


    More advanced: Test a connection to port 25 or whatever you're using as a submission port from the remote network, too.  You can use telnet or the openssl s_client to connect into the target port (cleartext or SSL/TLS) and verify connectivity.  (Though Connection Doctor will usually tell you about this.)


    Once you figure out one of the misbehaving clients, you'll probably have the rest sorted out, too.

  • iToaster Level 3 Level 3 (560 points)
    Currently Being Moderated
    Feb 17, 2013 7:25 PM (in response to James Rothschild)

    As MrHoffman says, check your mail server logs

    Has there been any network changes recently ?

    Dns mx changes

    Require user authentication to send


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