Mail Transfer Agents – Strict Transport Security (MTA-STS)
Mail Transfer Agents – Strict Transport Security (MTA-STS)
- April 23, 2021
- Posted by: Nicola Selenu

– a standard to improve the security of SMTP by enabling domain names to opt into a strict transport layer security mode that requires authentication (valid public certificates) and Transport Layer Security (TLS).
Author:Nicola Selenu
Email Service Providers Handbook
The most comprehensive “Handbook of Email Service Providers“!
SPAMASSASSIN RULES
All SpamAssassin rules in one place, EXPLAINED!
SMTP COMMANDS
& REPLY CODES
All SMTP/ESMTP commands and reply codes in one place, EXPLAINED!
Free DNS Tool
Check the DNS records of your domain with our free DNS tool.
Deliverability Glossary
The most comprehensive Email Deliverability and Marketing Glossary!
Mail Transfer Agents – Strict Transport Security (MTA-STS)
Mail Transfer Agents – Strict Transport Security (MTA-STS)
- April 23, 2021
- Posted by: Nicola Selenu


– a standard to improve the security of SMTP by enabling domain names to opt into a strict transport layer security mode that requires authentication (valid public certificates) and Transport Layer Security (TLS).
Author:Nicola Selenu
Email Service Providers Handbook
The most comprehensive “Handbook of Email Service Providers“!
SPAMASSASSIN RULES
All SpamAssassin rules in one place, EXPLAINED!
SMTP COMMANDS
& REPLY CODES
All SMTP/ESMTP commands and reply codes in one place, EXPLAINED!
Free DNS Tool
Check the DNS records of your domain with our free DNS tool.
Deliverability Glossary
The most comprehensive Email Deliverability and Marketing Glossary!