My Subscriber Replies To A Message, But It Is Not Delivered To The List
People can Reply to an email, or they can Reply All to an email.
Those two commands are in every email reader.
Depending on the list settings for your list, a Reply could go to the Individual who sent the message, or it could go the back to the list.
By default, that option is set to have the reply go back to the individual that sent the message
If your list has this setting, then if your member just hits reply, the message only goes back to the person who sent the message.
If your member selects the Reply All option, the message goes back to the list and the person who sent the message.
If you change the list setting to "Reply to List"
Then a simple reply will send any message back to your mailing list.
Note that the "Reply to List" option is controversial, especially on larger lists
It's easy to hit reply and assume that your message is a private email back to the person who sent the email.
But if the list settings are set to "Reply to List" a specail header is inserted into the email, that controls where the reply goes.
If people do not look at the address in the To line, they will end up sending a private email to the list, and that is not good.
The default "Reply to Individual" is the recommended setting for all mailing lists
And educate your subscribers to use Reply All when they want their reply to go to the mailing list