In the past few days, our domain seems to have been blacklisted by xtra. We are a small business trying to send emails to our customers.
Our emails are DKIM signed, and we have SPF records set up.
I can send two identical emails from the same server, just with different domains, and only one of our domains is blocked (so... not an RBL problem).
I can't see how/who to contact at Xtra to start resolving this issue... does anyone know who to contact?
edit: this is the error message:
host mx.xtra.co.nz [22.214.171.124]
SMTP error from remote mail server after end of data:
554 5.7.1 Message rejected due to possible spam content