On Tue, 20 Nov 2018 at 16:20, Laura Atkins <la...@wordtothewise.com> wrote:
> Are you able to deliver mail to any other trendmicro.eu hosted domain?
> If so, this isn’t a trendmicro issue, it’s an individual company deciding to 
> block specific senders.
> Asking each company to unbock / whitelist you is about your only choice.

We are not getting that error from every trendmicro.eu hosted domain,
but only a few of them (very few).
The first company (few weeks ago) replied that they didn't have
anything special configured to refuse our email and that they simply
used an "aggressive" level for filtering (I don't know what are the
configuration options for their users), so they added our IPs/domains
to their whitelist.
I'm waiting for a reply from the second domain postmaster@ address.

Stefano

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