I have an IIS server with multiple domains, multiple clients all many mailboxes. All of them are starting to fail when sending mail to Gmail accounts. with bounce-back and 550-5.7.1 error.
I've tried adding the following SPF to the domain DNS details -
"v=spf1 ip4:220.127.116.11 ip4:18.104.22.168 ~all"
No idea what else I can do.
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