If you are writing an SMTP agent, you might find it instructive to learn to speak SMTP yourself, both to aid debugging and to get a feel for what is happening "under the hood" when Ex...
Updated Jul 01, 2019
Version 2.0
Blog Post
It's worth noting that a lot of other e-mail servers would not be happy if you cut and pasted all those commands in one go - technically you need to wait for responses to each command before you send the next.