At this time, smtp.webfaction.com has been listed on the Proofpoint blacklist. This is affecting mail delivery to @icloud.com addresses and other domains that are protected by Proofpoint.
Getting the server de-listed is our top priority, and we are presently working with Proofpoint to identify the specific reasons for the listing. Once that’s done, we’ll work to resolve those reasons and get the server removed from the list.
We’ll update this post as more information becomes available.
2016-07-05 23:41 UTC: smtp.webfaction.com is no longer blacklisted.
2016-07-06 05:04 UTC: Our SMTP server appears to be blacklisted again, please stand by for further updates.
2016-07-07 21:08 UTC: smtp.webfaction.com is no longer blacklisted by Proofpoint. We are monitoring for any changes.
2016-07-15 00:15 UTC: The SMTP server has not been blacklisted in the past 7 days.