Re: What is the history of 2821 and implict MX?

[Frank Ellermann]

John C Klensin wrote:
 
> Use of WKS was explicitly deprecated

There is a trend in RFC 1123 wrt SMTP, oversimplification.

"Simply try to use a service to see if it's there" is not
so simple when that can take about 100 hours in 2821bis.

 Frank