> Nor do we, and it's likely they won't tell you because they consider
> such information to be proprietary and of potential use to spammers.

A way around these problems may be to use your ISP's mail-relay, rather than delivering directly. Or use a third-party mailer, such as fastmail.fm.

Usually your ISP is not on any black-lists, and they also (should) have mechanisms in place to get off such black-lists when they get on them.

Of course, to get lots of messages out via your ISP you may need to authenticate your connections and so on - I ended up building a custom version or postfix to use SASL and TLS, with which my ISP let's me specify 300 recipients rather than 50. Telling postfix "default_destination_recipient_limit=300" completed the magic.

        Cheers,
                Gary    B-)
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