Mail Servers Blacklisted

FYI, at least two of the mail servers (167.89.100.169 & 167.89.100.17) you use for confirming email addresses are blacklisted by Spamcop’s RBL:

postfix/smtpd[29959]: NOQUEUE: reject: RCPT from o1.hv1nn.shared.sendgrid.net[167.89.100.169]: 554 5.7.1 Service unavailable; Client host [167.89.100.169] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?167.89.100.169;

postfix/smtpd[30454]: NOQUEUE: reject: RCPT from o2.hv1nn.shared.sendgrid.net[167.89.100.17]: 554 5.7.1 Service unavailable; Client host [167.89.100.17] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?167.89.100.17

We use SendGrid to send our mail so this is an issue for them to have to resolve not us, but thanks for the report.