When reply all to a group (mailling list), the sender not received email

[calvincth02]

Hello All,

I have 2 email:

User 1: [email protected]
User 2: [email protected]
User 3: [email protected]

[email protected] and [email protected] belong mailing list name [email protected]

I use [email protected] to send email with this form:

to: [email protected]

@adam and @eva also get a mail, but when i use one of them to reply all this email (test on Outlook, Thunderbird), it's just to [email protected], not to the sender is @henry.

I check on Roundcube, and when reply all in this case, the form is:

to: [email protected]
cc: [email protected]

Anyone saw this case before?

How to fix it's?