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Update SRV records as per RFC 8314
Namaste,
As per RFC 8314 [1] , the use of STARTTLS is to be deprecated in favour of Implicit TLS. Further, there is a new "_submissions" SRV record for the 465 port.
We may want to change README from
_submission._tcp.example.com 86400 IN SRV 0 1 465 mercury.example.com
_submission._tcp.example.com 86400 IN SRV 5 1 587 mercury.example.com
to
_submissions._tcp.example.com 86400 IN SRV 0 1 465 mercury.example.com
_submission._tcp.example.com 86400 IN SRV 0 0 0 .
Dhanyavaad.
[1] - https://tools.ietf.org/html/rfc8314