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    [SOLVED] Re: Why does Postfix need to use an SMTP relay?

    587 is for client -to- server SMTP transmissions. No ISP should be blocking that. Thunderbird and MS-Outlook and probably every other thick email client support that port for sending authenticated...
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    [SOLVED] Re: Why does Postfix need to use an SMTP relay?

    If your server is on a DHCP range of IPs, then it will be blocked by almost all reputable email servers. You'll need to use the ISP-provided relay. The ISP will likely block all outbound port 25/tcp...
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    [SOLVED] Re: Why does Postfix need to use an SMTP relay?

    Perhaps.


    SMTP traffic server-to-server is on port 25/tcp.
    SMTP traffic client-to-server is on ports 465/tcp or 587/tcp. This usually requires authenticated connections, i.e. a...
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    [SOLVED] Re: Why does Postfix need to use an SMTP relay?

    In the beginning, MTAs would talk directory to each other. People running MTAs were good, so there MTAs were configured to be nice and follow standards. Nobody got spam. SMTP is the protocol used by...
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