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 Message submission agent...
Stars indicate closer matches.
Message transfer agent 
- S/MIME
- SMTP Authentication
- Email agent (infrastructure)
- Mail retrieval agent
- Mail user agent
- Mailgun
- Internet mail standard
- Application Configuration Access Protocol
- Dark Internet Mail Environment
- Exchange ActiveSync
- IMAP IDLE
- IMSP
- Internet Message Access Protocol
- JSON Meta Application Protocol
- Lemonade Profile
- Local Mail Transfer Protocol
- Mail Transfer Protocol
- MAPI
- Minger Email Address Verification Protocol
- On-Demand Mail Relay
- PHPMailer
- Post Office Protocol
- Push-IMAP
- Simple Mail Access Protocol
- Simple Mail Transfer Protocol
- SMTPS
- Opportunistic TLS
- VPIM
- Email authentication
- Anti-Spam Research Group
- Authenticated Received Chain
- Author Domain Signing Practices
- Backscatter (email)
- Bitmessage
- Bounce address
- Bounce Address Tag Validation
- Brand Indicators for Message Identification
- Certified Senders Alliance
- Certified Server Validation
- CRAM-MD5
- DMARC
- DNSWL
- DomainKeys
- DomainKeys Identified Mail
- Email encryption
- Forward-confirmed reverse DNS
- Hashcash
- Ident protocol
- MARID
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