Relationships and behavior
This article identifies various conditions that affect your access to Gmail's features when you're associated with one or more of a message's recipients, such as by being a member of a receiving group.
Messages you send to a group do not appear in the Inbox
Messages you send to a group are not listed in the Inbox when you are a member of the group, since Gmail presumes you would have seen the message before sending. However, the message does appear in Sent Mail and will appear in the Inbox once another member of the group replies to it. See Not receiving email from groups for additional details.
Messages you send to your email aliases don't appear in the Inbox
Messages you send to your email aliases are not listed in the Inbox unless you also set the alias as a sending address. You do this by adding the alias in question to the Send mail as list for the account. See Messages I send to my email alias don't appear in my inbox for more details.
Messages you send to yourself from third-party applications might appear as read
Messages you send to yourself from third-party applications sometimes appear as read in Sent Mail even if you haven't opened the message there. Such messages always appear initially as unread in your main Inbox, however.
Messages from your Google Sites edits appear in Sent Mail
Messages from your Google Sites edits appear in Sent Mail when you've edited a page others have subscribed to for change notifications. The messages come from: email@example.com
You receive email in your Inbox for others' Sites page changes only if you've subscribed to change notifications yourself. Further, to receive messages regarding your own edits, you must also elect to notify me of my own changes in Sites. See Getting notified when a site or page changes for instructions.
The Reply to all option does not appear
The Reply to all option does not appear when you have defined the receiving group as one of your own email addresses so you may send messages on behalf of the group. Gmail considers the group address an email alias of the user and therefore does not enable the option of replying to all in messages to the group.
The Reply to all option also does not appear when you are sending mail to other addresses owned by you. Gmail recognizes when you have chosen to send mail from a different address and considers all of these addresses part of the same primary account. Gmail wont let you to reply to all when logged into the primary account and all of the email addresses listed within the To field are owned by you. Even if the reply to all option initially appears, it will disappear if you elect to send from the primary address associated with the other recipients.