POP3 Configuration

Advanced POP3 options can be accessed from Configuration > POP3 Configuration > Advanced.

Buffer Size
The buffer size field defines the size of the POP3 message buffer in Kilobytes. This should be left at 4K.

Socket Timeout
This field defines the amount of time in seconds CMail will attempt to open a connection with a remote POP3 server before reporting a timeout failure. The default value is 30 seconds although this should be modified to between 45-60 seconds if you are connected to the Internet on a very slow modem link.

Accept Any Domain on POP Collection
With this option checked, CMail will pull all the POP3 messages in the mailbox on the remote server and place any emails addressed to addresses not ending in a supported domain in the Administrators 'Inbox'. Without this box checked, any such mail will be deleted from CMail.

Implement UIDL on collection from the Internet
If you have elected not to Delete mail from host after retrieval on the main POP3 configuration menu, you will need to enable UIDL to prevent CMail from downloading the same messages from the server each time it performs a mail exchange. All email messages have a unique number (UID) associated with them. CMail checks the UID of each message before it downloads it and will only pull messages with UID's which are not already present in the UIDL table.

Maximum size allowed for message
This option imposes a limit on the size of messages that CMail will download in KB. If CMail detects a message that exceeds the size specified here, it will not download the message. You can specify to download the first few lines of the message and also delete the message from your ISP's mail server. If set to 0, there is no limit on the message size.

If message exceeds Max get top x lines
If a message exceeds the maximum allowed size, you can opt to download the top few lines of the message to see who sent it. Specify the number of lines in this field.

Delete message from remote server
With this option enabled, CMail will automatically delete any message that exceeds the maximum limit from the ISP's server.

Delete mail on remote server after x days
If you have elected not to Delete mail from host after retrieval on the main POP3 configuration menu, this option will remove any mail that has been stored on the remote server for more than the number of days specified in the field.

Mail Sorting Options
When collecting mail via POP3, CMail Server can look for specific information about whom the original message was meant to be delivered to. If you are experiencing strange results when collecting via POP3, for example, all external mail goes straight to the Mail Administrator, it is worth checking each of these options in turn and re-collecting mail to see which method works with your Internet Service Providers mail system.

Use FOR Field to sort POP3 mail Looks for the embedded FOR field in mail processed by Sendmail 8.8.x
Use Apparently-To field to sort POP3 mail Looks for the embedded Apparently-To field generated by some email clients.
Use Reply-To field to resolve sender Looks for embedded Reply-to field in mail headers. Useful for Microsoft FrontPage mailto forms etc.
Use Delivered-To field to sort POP3 mail Looks for the second delivered to field to resolve recipient. (INDIGO)

Forward to
By entering another address in this field, CMail Server will automatically send any email retrieved by this POP3 account to the email address specified. The forwarding address can either be a local user in the format of 'username' or an external email address in the format of user@externaladdress.com. You should note that CMail will not attempt to sort any of the downloaded mail if this feature is enabled, mail will simply be forwarded on as soon as it has been retrieved.

Multiple Mailbox Support
Circumstances may arise where you need to collect mail from more than one POP3 Account. Click the Add button to create an additional POP3 mailbox entry.

  1. Click Multiple Mailbox Support from the Advanced POP3 Configuration Menu.
  2. Click the Add Button.
  3. Enter a description of the new entry in the Entry Name field.
  4. Enter the hostname or IP address of the additional POP3 server in the Hostname field.
  5. Enter the Additional POP3 Username in Username field.
  6. Enter the Additional POP3 Password in the Password field.
  7. Click OK to complete the entry.

Forward to
By entering another address in this field, CMail Server will automatically send any email retrieved by this POP3 account to the email address specified. The forwarding address can either be a local user in the format of 'username' or an external email address in the format of user@externaladdress.com. You should note that CMail will not attempt to sort any of the downloaded mail if this feature is enabled, mail will simply be forwarded on as soon as it has been retrieved.

Modifying an Existing POP3 Entry 

  1. Highlight the entry you wish to modify in the Existing Entries list.
  2. Click the Edit button.
  3. Modify the entries as necessary.
  4. Click OK to accept the changes.

Deleting an Existing POP3 Entry 

  1. Highlight the entry you wish to modify in the Existing Entries.
  2. Click the Delete button to remove the entry from the system.

The additional POP3 servers will be probed for mail after the main account has been checked.

Basic POP3 Configuration
Configuration Menu
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