Mac Mail and blocked ports

Hi,
I work in a not-very-Mac-friendly school district, but use a Mac anyway. We've figured out how to open the correct ports, etc. for internet use (via Network Preferences) but still can't access email (on an MS Exchange server) or any POP mail (Yahoo) or .mac mail through the mail program. I'm guessing it's something with a port somewhere that needs to be opened. Any thoughts on what it might be, or how to open ports on Mail?
Thanks for any help anyone might offer.
-Widget

From the client side, you don't need to open any ports in Sys Prefs Sharing at all. Opening ports there is only for dealing with inbound traffic that you didn't initiate and weren't expecting as a response to something, i.e., if you were a mail or web server. But you're not a server, you're a client. So close 'em. Plus, in Mail.app (or any other application for that matter), those port numbers (like 25 or 587 or 465 for smtp, or 110 or 995 for pop, or 143 or 993 for imap) are at the destination mailserver, not your computer.
If you launched Terminal.app, "su {adminUserName}" and "sudo tcpdump -i en1" (en1 if wireless, en0, if ethernet cable) you will find that when you launch Mail and try to check mail or send mail, stuff from your computer is leaving your machine on a randomly chosen (by Mail.app) five-digit port number and it's at the destination server where these port numbers (25, 587, 465, 110, 995, 143, 993) have any meaning. Same holds true for all applications, e.g. Safari, port 80 refers to the web server, not what port on which you are sending out your browser request to the server. The (mail, web, other) server responds back from its port (25, 143, ..., 80, etc.) port to the random port number that your application chose.
Your problem, most likely, is that your IT Dept is blocking outbound traffic destined for any "foreign" host addresses at ports like 25 or 143, that are NOT the host addresses of your IT Dept's own mailservers. They would be blocking this at their firewall to the internet. My work's IT Secret Police does this. So unless they relax their firewall restrictions, you're going to have to do something like use your cellphone as a dialup modem to access those mail accounts, or use webmail (since they probably aren't blocking all http (destination server) port 80 traffic -- although they could be blocking traffic addressed to specific host addresses like yahoo.com/webmail).

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B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;A2 4 20 21;B7 6;B2 9;A4 14 7 52 9;B2 10;B6 9 10 4;C3 25;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;D13 25 37 32 33;A1 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D23 14 1 48 42;D12 34 43 53 44;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D23 14 2 48 43;D13 4 5 32 1;D22 4 4 50 0;D13 14 3 49 5;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-  
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    Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

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    The problem was fixed since beta firmware 2.00.11.
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  • Conflict between program Mac mail and program Microsoft Outlook e-mail???

    Denmark, Kolding, 30th of September 2010
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    Therefore I have discussed these issues with 2 different and independent Mac users to find out in testing other Mac users will have the same problems as outlined in the below mentioned situations.
    I will therefore outline the coverage issues, as mentioned, including occurs on my iMac 21.5 " with serial number: <Edited by Host> and 2 friends with their Macbooks of new dates as follows:
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    Best regards
    Peter Larsen
    <Edited by Host>

    Welcome to Apple Discussions!
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  • Mac Mail and Address Book Syncing

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    [email protected] wrote:
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    Hello,
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