Hector Santos wrote:
But I always thought it wasn't necessary, and simply having a
clarification on three key questions would be sufficient:
- Must all the reply codes be the same?
- If not, the final return code (last line) is valid code?
- 150 SHOULD/MUST NOT be used without extended clients?
Not applicable, because "all reply codes MUST be the same" takes
care of this.
The specific "keep alive" functionality still needs to widely tested.
But the proof of concept is well established. It does work and there is
no surprise from a programmability technical standpoint that it does.
It does not work, apparently, if the SMTP client is Sendmail, which
I'm told treats the 150- as an error. Sendmail is still a
sufficiently-popular SMTP client that any server using 150-
continuation lines will break on a large proportion of incoming