Emails not being sent to gmail addresses

[Phil0802]

I have been using Windows 11 mail with no problem for months. All of a sudden any email I send from my work email accounts (names.co.uk) to a gmail address is returned with the following;host gmail-smtp-in.l.google.com [66.102.1.27] SMTP error from remote mail server after pipelined end of data: 550-5.7.1 [85.233.160.19] Messages missing a valid messageId header are not 550 5.7.1 accepted. r15-20020a5d6c6f000000b0023422faf70esi4706631wrz.887 - gsmtpUnder advice from an IT wise friend I reloaded my email accounts, had success with emails the

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