On 07/08/2017 16:19, Stefano Bagnara wrote:
we're an italian ESP and we never had success contacting Alice.it
postmaster. Alice.it is the freemail domain of the biggest telecom
operator in italy (Telecom Italia, now named TIM).
We never had major deliverability issues (blocks/junking) there, but
sometimes their server are very slow (don't know if it is throttling
or simply overload) and queues get very big (last time was the past
february and lasted a couple of weeks). We use a very very high
timeout for them (20 minutes, instead of 2 minutes we use for
everyone else) because we experienced double deliveries due to
timeout on our side after the ending DATA "." (the very point the RFC
says the server should try to answer as fast as possible to avoid
double delivery).
I can confirm that one can't get an email answer from them.
About that timeout after DATA: we once had a telephone call with an
internal source from the same company, and we were told that they are
intentionally delaying messages from IP addresses whose PTR record's
organizational domain doesn't match the sending address' domain part.
What the "sending" address is (friendly from, envelope sender?) was
obscure, but given the delay happens after the DATA phase, it seems
likely that it is the one in the "From:" header (otherwise they could
just delay the messages before receiving them). This sounds like an
exotic measure for sure.
On the other hand, the delays tend to vary over time, so it's still
possible that they have nothing to do with this particular rule.
--
Federico
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