thingsaurus
This is a 'thesaurus for things' or similarity engine: results show things that have something in common with what you enter. The more stars, the more things in common! You can use it for research, recommendations or simply to explore ideas and related subjects.
Here are your results for Qmail...
Stars indicate closer matches.
Apache James 
- Courier Mail Server
- Cyrus IMAP server
- Exim
- MeTA1
- Postfix (software)
- Sendmail
- Dovecot (software)
- Axigen
- OpenSMTPD
- Haraka (software)
- HMailServer
- Internet messaging platform
- Smail
- Zentyal
- Agorum core
- Citadel/UX
- FormMail
- Message transfer agent
- Cc:Mail
- Cleancode eMail
- CommuniGate Pro
- Comparison of mail servers
- Corporate Headquarters Office Technology System
- Delivermail
- List of email archive software
- Eudora Internet Mail Server
- Email migration
- History of Microsoft Exchange Server
- Microsoft Exchange Server
- Geomessaging
- Gordano Messaging Suite
- Hula (software)
- IceWarp Mail Server
- Internet Information Services
- Ipswitch IMail Server
- Kerio Connect
- List of mail server software
- Lotus Foundations
- M+NetMail
- Mailsite
- MDaemon
- Mercury Mail Transport System
- Milter
- MMDF
- Oracle Communications Messaging Server
- Policyd-weight
- POP3 Connector
- Process driven messaging service
- Qpsmtpd
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