SmartPOP2Exchange
- POP / POP3 Connector for Exchange and SMTP servers
- http://www.jam-soft.com/smartpop2exchange/

Eclarsys PopGrabber
- Retrieves emails from POP3 accounts and forwards them to an SMTP server. Free 3 account version available for download.
- http://www.eclarsys.com/popgrabber/

PYTHEAS MailGate for Microsoft Exchange et Lotus Domino
- POP3 gateway for Microsoft Exchange and Lotus Domino. Interface for SpamAssassin and anti-virus scanner, rules based content checking, optional outgoing mail handling.
- http://www.pytheas.com/pmg/en/intro.asp

Hexamail POP3Downloader
- Hexamail POP3 Downloader is a tool to download emails from one or more POP3 accounts (including catchall accounts) and forward email to an SMTP server, or Exchange
- http://www.hexamail.com/hexamailpop3downloader/

SMTP Mail Gateway
- Spam and Virus filtering for mail servers. Online Signup and Free Trial available.
- http://www.apm-gateway.net/

Messaging Solutions LLC
- Offers a product that protects users from spam, porn and viruses and keeps track of who sends and receives company e-mails and attachments.
- http://www.messagingsolutions.com

TFS Gateway
- Internet Gateway for Exchange, Notes and Groupwise including anti-virus hooks
- http://www.tfstech.com

POPWeasel
- Software including MailGate - Mail Server and Proxy Gateway, and POPWeasel - POP3 collection for SMTP only Mail Servers.
- http://www.mailgate.com/products/wfeatures.asp

POPcon
- Exchange POP3 Connector, downloads your email from all your POP3 mailboxes and distributes it to Exchange Server users.
- http://www.exchange-pop3-connector.com

Exchange POP3
- Internet gateway for Microsoft Exchange server retrieves messages from single and multiple recipient POP3 accounts.
- http://www.exchangepop3.com/