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Home/ Questions/Q 6579455
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T15:54:00+00:00 2026-05-25T15:54:00+00:00

Alright, so this is absolutely killing me… If anyone could help me, I would

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Alright, so this is absolutely killing me… If anyone could help me, I would be the happiest man on the face of the earth…

So, I need to create a C++ email client for a project at school, and I’ve been using the POCO open source C++ library, and I’ve been fine for working with email servers that do not need SSL authentication, but anything that DOES require SSL, I’ve had no luck…

Here is the documentation for POCO: http://pocoproject.org/docs/

When you go there, you have to click on POCO:Net, and then in the bottom left frame, there is a bunch of documentation for different NET objects… I’ve particularly been using POP3ClientSession.

I’ve installed OpenSSL and compiled the library with SSL support, but nothing seems to work… I’ve also followed this tutorial:
http://pocoproject.org/wiki/index.php/NetSSL

If ANYONE has experience with POCO, or is just 1337 at SSL/C++, if you could help me get this working I would very much appreciate it! I’ve been working on this for the past 12 hours straight just to get SSL working, and have had 0 luck.

Well one of the things I’m not even quite sure about is if I compiled it with SSL correctly… I installed OpenSSH on my machine, and recompiled everything (took an hour!!!). I seemed to have everything compiled, but when I went to use it with the following include statement:

#include "Poco/Net/SecureStreamSocket.h" 

Which is what the documentation told me to do, I got an error… They compiled in a folder called NetSSL_OpenSSL, so i took the headers and sources and copied them into the appropriate place in the Net folder, hoping for it to work. Afterwords I got another error:

fatal error C1083: Cannot open include file: 'Poco/Crypto/X509Certificate.h': No such file or directory I dont see Crypto anywhere... 

But I do have the X509Certificate.h file… I even went as far as changing Crypto in the source to Net (because its the net folder that is now holding this file), but as I expect, that blew up in my face…

So, I guess the main question would be the following:

How can I send emails using POP3 with SSL sockets instead of the standard sockets used by the POP3ClientSession?

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  1. Editorial Team
    Editorial Team
    2026-05-25T15:54:01+00:00Added an answer on May 25, 2026 at 3:54 pm

    As the error states

    fatal error C1083: Cannot open include file: ‘Poco/Crypto/X509Certificate.h’

    This means it cant find the file, that is the only problem!!!

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