sendmail rejecting domains (rackshack.net)

Every "co.uk" domain I send mail from bounces when trying to send to my address, jason@wickedmoon.com, on my dedicated RaQ4i hosted with rackshack.net. I've tried this with at least a dozen business contacts and friends who all have co.uk email accounts and domains, with the same result - email bounces back with a message similar to "Senders address does not exist".

Now Rackshack say this is an "unfortunate positive side effect" of using sendmail. That the host from which the email is sent should be responsible enough to maintain proper DNS records. Unfortunately the bottom line is email across many different networks is not getting through and puts a dampener on my idea of running an email service.

I wondered if this was a known quirk with sendmail on the RaQ? Is it just Rackshack? Is sendmail configured differently on the RaQ? As I've never experienced this problem before on the many hosts I've been with over the past 4 or 5 years. Is it fixable?

 

 

 

 

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