First post to this group, so please forgive anything I'm doing wrong.

Environment: I develop a small booking solution using a RaspberryPi, the Apache 
server and - besides plain HTML pages - an Apache module written in C/C++ to 
handle booking logic requests.

Problem: everything is going fine except for sending a confirmation mail to 
users once a booking has been successful. I use 
https://github.com/somnisoft/smtp-client as a simple C based SMTP client 
embedded into the module. While the function to send a mail is working fine 
when compiling it as a separate C program and running it from the command line, 
it fails when embedding  the function into my Apache module. For SMTP, port 465 
and TLS security (openssl) is used.

Question: is it possible the server blocks outgoing traffic to an external SMTP 
server using a specific port? Can this be white listed somewhere in Apache 
configuration?

Thanks and greetings Harald


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