On 10.06.17 14:53, SZÉPE Viktor wrote:
RFC 5321 states in

The lookup first attempts to locate an MX record associated with the name.
... If an empty list of MXs is returned,
the address is treated as if it was associated with an implicit MX
RR, with a preference of 0, pointing to that host.

Were you a ware of that?
I think it is very unusual and dangerous.

Do modern MTA-s - including Courier - implement that?

This behaviour was described in rfc 821 and 2821.
AFAIK all MTAs implement this behaviour since MX records were implemented.

What and why exactly sounds unusual and dangerous to you?

Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Despite the cost of living, have you noticed how popular it remains?
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
courier-users mailing list
Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users

Reply via email to