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Emails to Comcast Delayed or Undeliverable

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Emails to Comcast Delayed or Undeliverable

Since yesterday, we are having issues sending emails to our customers with comcast.net emails. Our relay is shows a series of delivery message errors and usually the message will get delivered after a few hours. Our domain, williamskastner.com, is not on any Blacklists. Could we be greylisted by Comcast.net. Below is the text of the errors we are seeing: Rejected Failed [lost connection with mx1.comcast.net[96.114.157.80] while sending end of data -- message may be sent more than once] 8/26/19 9:23:43 AM 96.114.157.80 mx1.comcast.net Certificate is not verified Rejected Failed [lost connection with mx2.comcast.net[68.87.20.5] while sending end of data -- message may be sent more than once] 8/26/19 9:24:35 AM 68.87.20.5 mx2.comcast.net Certificate is not verified Rejected Failed [lost connection with mx1.comcast.net[96.114.157.80] while sending end of data -- message may be sent more than once] 8/26/19 9:44:18 AM 96.114.157.80 mx1.comcast.net Certificate is not verified Rejected Failed [lost connection with mx2.comcast.net[68.87.20.5] while receiving the initial server greeting] 8/26/19 9:44:18 AM 68.87.20.5 mx2.comcast.net Sent 8/26/19 11:29:45 AM 96.114.157.80 mx1.comcast.net