I'm getting complaints that several of our mails from our campaign are bounced because the Campaignmonitor mailserver is blacklisted at five-ten-sg.com. See the following link:
Are there any actions taken to get this server removed from the blacklist?
We're actually aware of this listing, but it should in no way impact your deliverability when sending with Campaign Monitor. We are listed in their "bulk" category, purely because we allow our customers to choose between single and confirmed opt-in. You can read more about the advantages and disadvantages of both approaches here.
We have never seen evidence of this contributing to an email not being delivered, and have been told by a number of deliverability experts that this list is largely irrelevant.
Of course, if you're being told otherwise we'd be more than happy to follow this up for you immediately. Get in touch if you have more specifics of this list causing problems and we'll look into it for you.
Hi Dave, thanks for your reply. I actually have one proof of a mail rejected because of this blacklist, see sendmail log (mail-addresses anonymized):
Apr 14 13:47:24 agrippa sm-mta: n3EBlOTv008849: Milter: to=<email@example.com>, reject=550 5.7.1 mail from 220.127.116.11 rejected - local; see http://www.five-ten-sg.com/blackhole.php?18.104.22.168
Apr 14 13:47:25 agrippa sm-mta: n3EBlOTv008849: from=<firstname.lastname@example.org>, size=0, class=0, nrcpts=0, bodytype=7BIT, proto=ESMTP, daemon=MTA, relay=m6.createsend.com [22.214.171.124]
I'll try to find out more info when talking to the admin of this mailserver again.