Question 1

How do I send an email with attachments using mailio?

Accepted Answer

Create a message object, set headers and content, add attachments as MIME parts using the library's MIME handling, then use the smtp class to authenticate and submit. Check the examples directory for advanced usage beyond the basic README snippet.

Question 2

mailio vs C++ email libraries like libetpan or VMime?

Accepted Answer

mailio uses modern C++17 with Boost, focusing on RFC compliance and cross-platform support. It has more active contributions than libetpan, but VMime might offer more mature features for specific protocols, so evaluate based on your project's need for simplicity versus extensibility.

Question 3

Does mailio work with Gmail's OAuth2 authentication?

Accepted Answer

The README mentions using application passwords for Gmail when 2FA is enabled, but it does not natively support OAuth2. You may need to handle OAuth2 tokens externally and pass them as credentials in the authenticate method, which supports plain login methods.

Question 4

How to build mailio on Windows with Visual Studio?

Accepted Answer

Use CMake to generate a Visual Studio solution from the source, then build the INSTALL project. Ensure Boost and OpenSSL are configured via CMake options like -DBOOST_ROOT and -DOPENSSL_ROOT_DIR if not in the default path, as per the setup guide.

Question 5

Can mailio parse emails with nested MIME messages?

Accepted Answer

Yes, it supports recursive MIME parsing, meaning it can handle embedded messages within other MIME parts, as stated in the features list that includes 'all media types are recognized, including MIME message embedded within another message'.

Question 6

Is mailio suitable for high-volume email sending in server applications?

Accepted Answer

While it can handle SMTP sending, the synchronous I/O and lack of asynchronous support might bottleneck throughput. You'd need to implement custom threading or connection pooling for concurrency, as the library does not provide built-in async features.

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