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Editorial Team
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Asked: 2026-05-16T05:27:29+00:00

Is it possible to send e-mails using smtp through proxy with delphi. I have

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Is it possible to send e-mails using smtp through proxy with delphi.
I have build some e-mail sending applications before, using SSL etc. but i didn’t use proxy before, has anyone idea how i can do that with delphi.

Thanks.

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  1. Editorial Team

    The correct way to use a proxy with Indy’s TIdSMTP component is to utilize the SocksInfo (Indy 9 and earlier) or TransparentProxy (Indy 10) property of TIdIOHandlerSocket.

    For Indy 9 and earlier (only supports SOCKS v4/4a/5 proxies):

    1. Assign a TIdIOHandlerSocket component to the TIdSMTP.IOHandler property
    2. Assign a TIdSocksInfo component to the TIdIOHandlerSocket.SocksInfo property.

    For Indy 10 (supports SOCKS, HTTP, and custom proxies):

    1. Assign a TIdIOHandlerStack component (derives from TIdIOHandlerSocket) to the TIdSMTP.IOHandler property
    2. Assign a TIdSocksInfo, TIdConnectThroughHttpProxy, or other TIdCustomTransparentProxy-derived component to the TIdIOHandlerSocket.TransparentProxy property.
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