Test tool havedane.net and NCSC-NL factsheet on DANE

[Bart Knubben]

1. Check this new tool for testing if your mail server checks DANE
when sending email: https://havedane.net

2. Recently the Dutch NCSC published a factsheet "Secure the
connections of mail servers" with regard to DANE and STARTTLS. See:
https://www.ncsc.nl/english/current-topics/factsheets/factsheet-secure-the-connections-of-mail-servers.html

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Best regards,
Bart Knubben