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We experienced an issue with automated email messages from a financial institution being rejected where the following was logged:

<snip> ruleset=CheckMessageId <snip> reject=553 5.0.0 Header Error

The associated Sendmail ruleset shows the following:

R< $+ @ $+ >        $@ OK

I found that the institution's message-id did not contain the angle brackets. In order to permit messages from their domain, would I add the following rule?

R $+ @ example.com        $@ OK
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It is a workaround that will help you.

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