I am sending to you a functional version of the program. It provides all the features you asked for. To install the application launch the attached installer. After installation an icon will be placed on Desktop.

The user interface consists of 3 sections:
- Activity
- Email accounts
- E-mail Responses

I am going to describe each section in the lines bellow:

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Activity
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This is where the main action takes place. When the "Start" button is clicked the program will try to connect to each active account defined in the "E-mail accounts" section. Accounts that are not set active are skipped.
If the connection is succesfull a short info is displayed in the message window telling the user about the number of new messages found in that account and the number of replies sent back to sender. If an error occur the message "Unable to connect to <POP3|SMTP> host is displaied". Connection fails in most cases if the username/password combination is not correct or if the host name is not correct. 
Also the 2 progress bars will reflect the percent of the task completion.


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Email accounts
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In this section you can define POP3 accounts that should be checked by the program.
To insert a new account use either the "Insert" key or right click on the "E-mail account" grid and select Insert.
To delete an account use either the "Delete" key or right click on the "E-mail account" grid and select Delete.

POP3 fields description:

Active = sets active/inactive the selected account. Only active accounts will be checked by the program
E-mail address = this email address will appear as the sender of the reply
POP3 Server = the POP3 host on wich the selected account exists
UserID = username to login in the mailbox
Password = password to login in the mailbox. The password is stored encrypted on disk. That's why you won't see the "***" inside the password field even if it is set the password. To change the password simply type in the new password in the password field and click the "Ok" button to validate the change.

Port = the port on wich the POP3 server listen. This is in most cases 110.

SMTP fields description

SMTP Server = the SMTP server used to send the reply for the messages in this account. This can be the same for 		all accounts. However in most cases the POP3 server acts as an SMTP server also so probably the SMTP server will be different from account to account.
UserID = there are SMTP servers that require an UserID in order to let you to send an email. If this is the case fill in the username in this field.
Port = the port on wich the SMTP server listen. This is in most cases 25.

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E-mail Responses
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In this section you can define the responses that will be sent back to original senders.
There are five lists defined. You can change the current list from the dropdown list.

To insert a new response first select the list number in wich you want to insert a new response than either press the "Insert" key or right click on the "Responses" grid and select Insert. The response title is for information purpose only - it will help you to identify different responses. The text that is actually emailed back to senders is from the "Response Details" field.
To delete an response use either the "Delete" key or right click on the "Responses" grid and select Delete.

At the left bottom side of this section there is a field where you can set the number of emails after the level of response is incremented to the next one. By default it is 5. Meaning that for the first 1 - 5 emails received from a particular sender a random response is sent from the "Response list 1". For the next 6 - 10 emails a random response is sent from the "Response list 2" and so on.