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How can I configure POP3 or IMAP mail retrieval on the Email Security Gateway?

  • Type: Knowledgebase
  • Date changed: 10 months ago
Solution #00003057

All Barracuda Spam Firewalls, firmware versions 3.5.11 and above.

The POP3/IMAP mail-retrieval and forwarding utility is configured on the Advanced > Remote IMAP/POP Accounts page; it fetches mail from remote mail servers and forwards it to your local machine's delivery system. Basically, this utility downloads messages from the specified POP and IMAP accounts to the inbound queue, processes them (using Virus Scanning, Custom Policy, Fingerprint Analysis, Intent Analysis, Image Analysis, Bayesian Analysis, Spam Scoring, and, for Global configurations, Recipient Verification), and then delivers them according to the Email Address/Domain specified. You can repeatedly poll each account at a specified interval. This utility can gather mail from servers supporting POP3 and IMAP4.

This utility has two fundamental types of operation for each user account from which it retrieves mail: Global- and User-type. With User-type, it assumes that all messages in the user's account are intended for a single recipient; with Global-type, it is used when more than one recipient under the same domain are specified for a particular server account. When the Type is to Global, the specified domain which will be used to determine per-domain processing rules. Only mail whose recipients match this domain will be processed, meaning that the Barracuda Spam Firewall will check these recipients using Recipient Verification. When the Type is set to User, the specified email address will receive all fetched mail for this account.

Domains specified as Email Address/Domain domains, and the domains of similarly specified email address, must be local domains that have been predefined on the Domains > Domain Manager page in order to be forwarded to the appropriate mail server(s).

Descriptions for each of the options on the Advanced > Remote IMAP/POP Accounts page follows:
  • Enable Remote IMAP/POP Accounts - Enable or disable the polling of remote IMAP and/or POP mail servers for all configured accounts.
  • Connection Timeout - The maximum number of seconds to wait for a response from IMAP and POP mail servers before timing out the connection.
  • Server Name/IP - This is the hostname or IP of remote mailserver. 
  • Polling Interval (seconds) - This is the interval specified for polling the account.
  • Protocol - This is the protocol defined: POP3 or IMAP.
  • Port - This option defines the port to use when connecting to the remote mailserver for mail retrieval. By default it is blank, and a blank Port will signal the Barracuda Spam Firewall to use the default port for the selected Protocol (110 for POP3 and 143 for IMAP).
  • SSL - This option defines whether the Barracuda Spam Firewall will use SSL to access the configured POP or IMAP account.
  • User - This is the username of the remote mailserver account.
  • Password - This is the password of the remote mailserver account.
  • Type - This is the type of operation for retrieval, either Global or User.
  • Email Address/Domain - This defines the destination the email address for a single recipient, or the domain name for multiple recipients.
Additional Notes:
Do not retrieve mail from and deliver mail to the same POP or IMAP account; this could result in the Barracuda Spam Firewall continually scaning and redelivering the same messages.

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