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My client is trying to email a customer of Plusnet but they are getting an error message - '552 Spam Message Rejected'.
I'm unsure of what could be causing this - could someone please help to diagnose the issue as my client needs to send his customer an invoice for a purchase.
The email was sent from firstname.lastname@example.org - this is a google mailbox and (I'm his developer) I've checked DKIM and SPF is fully set up on the domain.
Final-Recipient: rfc822; #####@#####.force9.co.ukAction: failedStatus: 5.0.0Remote-MTA: dns; mx.avasin.plus.net. (22.214.171.124, the server for the domain #####.force9.co.uk.)Diagnostic-Code: smtp; 552 Spam Message RejectedLast-Attempt-Date: Wed, 20 Dec 2017 07:25:51 -0800 (PST)
Hello, and welcome to the forums.
I suggest you edit your post to remove/obfuscate the email address, that's because spam bots could easily pick up the address from these forums.