Hi there,
We're having problems sending/receiving email; there are extreme delays (which is a serious issue as we provide legal services). I have updated our DKIM, SPF, and MX records. It seems to be associated with sending attachments, but we appear to have a fair bit of storage space left. Some get through eventually - the reason given for failure follows.
4.7.0 This message does not have authentication information or fails to pass 4.7.0 authentication checks. To best protect our users from spam, the 4.7.0 message has been blocked. Please visit 4.7.0 https://support.google.com/mail/answer/
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Any help would be appreciated!