Hi Daniel,

You are not providing any detail and I presume you are new here. The
question you ask is too broad to provide a good answer. Most people here
make their question much more specific, including details, so that it can
get answered.

Please read up and be more specific. Some resources for you (on what you
should to adhere to; not sure what the emails are about). If you have
questions on these, we might be able to answer:
- https://www.spamhaus.org/faq/section/Marketing%20FAQs
-
https://securityintelligence.com/the-art-and-science-of-how-spam-filters-work/
- https://blogs.msdn.microsoft.com/tzink/

Have fun reading.


David

On 20 June 2017 at 15:47, Daniel Hadfield <d...@pingsweep.co.uk> wrote:

> We're seeing issues with a clients mail being rejected as "spam"
>
> But they don't seem to be on a blacklist, was wondering if someone can
> help shed some light on it
>
> _______________________________________________
> mailop mailing list
> mailop@mailop.org
> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
>
>


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