Hi!
I have the same problem with microsoft exchange 365 is sending to a plesk server. The plesk server denied the receiving with 550 5.7.23. It is not a possible way to whitelist all mailprovider...
Hi!
I wonder if there is no possibility to send mails that are blocked with rbl lists, to the customer spamfolder. We here in austria are not allowed to block any customermails. Fals positives are so also obsolete.