Which VPS provider is that?
We send mail from a Linode VPS in Frankfurt, which works fine most of the time but a couple of times a year Microsoft puts us on a blacklist, most likely because of a neighbouring IP sending spam.
We send mail from a Linode VPS in Frankfurt, which works fine most of the time but a couple of times a year Microsoft puts us on a blacklist, most likely because of a neighbouring IP sending spam.