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Email to any comcast.net bouncing with comcast ESMTP server not available

Regular Visitor

Email to any comcast.net bouncing with comcast ESMTP server not available

Hi,

 

I have a comcast email address and I run an email list on my server. Suddenly all email I send to any comcast.net email address is bouncing with the following messages:

 

554 resimta-ch2-14v.sys.comcast.net comcast ESMTP server not available
 
or
 
554  resimta-po-15v.sys.comcast.net comcast ESMTP server not available
 
This happens from both my host and from Sendgrid.com (which I use as a smart host)
 
After many test emails, here are the servers that are rejecting my connection attempts:
resimta-ch2-09v.sys.comcast.net
resimta-ch2-10v.sys.comcast.net
resimta-ch2-11v.sys.comcast.net
resimta-ch2-12v.sys.comcast.net
resimta-ch2-20v.sys.comcast.net
resimta-ch2-22v.sys.comcast.net
resimta-po-04v.sys.comcast.net
resimta-po-04v.sys.comcast.net
resimta-po-06v.sys.comcast.net
resimta-po-10v.sys.comcast.net
resimta-po-11v.sys.comcast.net
resimta-po-15v.sys.comcast.net
resimta-po-16v.sys.comcast.net
resimta-po-21v.sys.comcast.net
resimta-po-25v.sys.comcast.net

 

And here are the ones that accept the connections:

resimta-ch2-14v.sys.comcast.net 
resimta-ch2-15v.sys.comcast.net
resimta-ch2-19v.sys.comcast.net
resimta-po-13v.sys.comcast.net
resimta-po-19v.sys.comcast.net

 

It doesn't look like a block on my mailserver IP, since it happens from both my server (IP: 66.35.84.90) and sendgrid.com's servers.

 

Can anyone tell me what's going on?

 
Thanks in advance
Regular Visitor

Re: Email to any comcast.net bouncing with comcast ESMTP server not available

It looks like this has been resolved, but I didn't do anything, so I would like to know what caused the problem & how it was resolved.