Resolved - We've been alerted to a scam/phishing email that is being sent to random email addresses of customers with "smtp2go" in their SPF records, or who had "smtp2go" in their SPF records in the past.

The subject line looks like this:
" [Request #1045512]"
"[Error : account disabled]"

Please note that this is not an official email, but a clever fake. Do not click the links in the email. If you have clicked it, please immediately go to the official SMTP2GO website, log in, and update your password. You may need to check your plan details as they may have changed without your knowledge. Contact support so that we can check your account.
Sep 13, 18:24 UTC