Robuta

https://www.mail-archive.com/courier-users@lists.sourceforge.net/msg38987.html

Re: [courier-users] courieresmtpd: STARTTLS failed: Certificate is bad

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https://openwall.com/lists/oss-security/2021/08/16/2

oss-security - Re: STARTTLS vulnerabilities

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https://pastebin.com/BFLdS4gA

Simple IMAP client (STARTTLS + cram-sha256) with Bash and OpenSSL - Pastebin.com

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https://thehackernews.com/2016/03/smtp-sts-email-security.html

What is SMTP STS? How It improves Email Security for StartTLS?

What is SMTP Strict Transport Security? How SMTP STS improves StartTLS for Email Security?

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https://www.openwall.com/lists/oss-security/2021/06/28/2

oss-security - CVE-2021-33515: Dovecot SMTP Submission service STARTTLS injection.

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https://nostarttls.secvuln.info/

We present multiple vulnerabilities related to the use of STARTTLS

https://en.internet.nl/

Test for modern Internet Standards like IPv6, DNSSEC, HTTPS, DMARC, STARTTLS and DANE.

Test for modern Internet Standards IPv6, DNSSEC, HTTPS, HSTS, DMARC, DKIM, SPF, STARTTLS, DANE, RPKI and security.txt

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https://therecord.media/starttls-implementations-in-email-clients-servers-plagued-by-40-vulnerabilities

STARTTLS implementations in email clients & servers plagued by 40+ vulnerabilities | The Record...

Jul 5, 2023 - Academics said they discovered more than 40 security flaws in the implementation of the STARTTLS feature in today\'s most popular email clients and email...

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https://www.mail-archive.com/announce@apache.org/msg07588.html?utm_source=feedly

CVE-2022-28220: STARTTLS command injection in Apache JAMES

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