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Claranet! I used them last millennium.
There will probably be way to add either SPF or DKIM authentication
In your customer UI. If not, ask their support.Edit: on rereading, it sounds like you are using a Claranet domain, not your own? In which case they need to sort it out, and have probably misconfigured something.
Any ideas what I can do to fix this - I have an email service / domain with Clara Soho, more or less a relic of early days of internet but I like to keep the email addresses this provides. Recently I get my emailed bounced when sending on to Gmail addresses with the following error:
host gmail-smtp-in.l.google.com [66.102.1.27]