I sent an email to a customer and got this bounced back to me ..........
Do I really have to give loads of details to be unlisted?
SMTP error from remote mail server after RCPT TO:<email@example.com>:
host clustera.tstechnology.net [18.104.22.168]:
554 5.7.1 Service unavailable; Sender address [firstname.lastname@example.org] blocked using multi.surbl.org; Blocked, xxx.ie on lists [ph], See: