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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]

SMTP error from remote mail server after pipelined end of data:
550-5.7.26 This mail is unauthenticated, which poses a security risk to the
550-5.7.26 sender and Gmail users, and has been blocked. The sender must
550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,
550-5.7.26 DKIM checks did not pass and SPF check for

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chez_jay in reply to @ChasnotRobert

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.

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ChasnotRobert in reply to @chez_jay

Thanks, I'll take a look.
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gbj_tester in reply to @chez_jay

it sounds like you are using a Claranet domain, not your own?

Seems unlikely that Claranet would not have configured SPF and DKIM for their own domain.

I had to do this for exactly the same reason (Gmail bounces) on a couple of domains I have on Ionos. It's not rocket science, you just have to insert an extra field into the DNS record, although it took a while to work out how to do that and what to put in the field.

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