I am the Chief Privacy Officer at dotmailer, an email service provider. I am responsible for the organizations email deliverability team as well. I've been made aware of significant issues delivering to Virgin Media domains, specifically ntlworld.com. We are seeing a lot of the following error:
Our teams have reached out to postmaster@ as well as abuse@ for quite some time, but have not managed to connect with anyone to help resolve the issue. I am hoping someone here can help out with this. We take compliance and anti-abuse very seriously at dotmailer and would like to resolve any issues. As we do not have an FBL with any Virgin domains, I would like to work with the abuse desk folks directly to get things fixed and keep bad actors from using our platform.
_________________________________________________________ Graham I am a VM customer. There are no guarantees that my advice will work. To say thanks click the kudos thumb. If I have solved your problem please click the helpful answer button.
Thank you for the quick reply and I appreciate the poster's status link, that will be helpful! I've looked at the other two links you provided and we've not really seen problems with spam content or issues with the receiver end. We've actually had VM recipients contacting our clients saying that their email is missing (not in the spam folder and not in the inbox), although the emails were sent via our platform.
Also, we follow the posted best practices which can be found here:
It would be great if someone from the forum could look in to this a bit closer. Out of all the receivers we send to (thousands), it seems that VM domains are our biggest problem area and I'd like to see what we can do to make sure we're following all the best practices (including sending cadence, email list hygiene, abuse complaint handling/bounce handling and MTA settings).
Again, thank you and I am looking forward to making some progress on this.
Thank you for the response. Yes, the 421 would seem that we have too many connections, but we've significantly reduced the number of outbound SMTP connections (basically the lowest I've seen for outbound email without having clients complain about delivery delays). We also have our MTA configured to enter into "backoff mode" when it sees these strings, so I am somewhat baffled.
And, no worries on teaching me to suck eggs , by reading the posts on this forum it looks like you could all run circles around me! I love it and I like to learn - seems like this is the right place for that!
It would be more helpful is you provided public information on this. I too am getting these all the time. It seems VM can't cope. E.g.
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 4 hours on the queue on bosmailout02.eigbox.net.
The message identifier is: 1aiPHB-00053s-VU
The subject of the message is: Fwd: Re: ***************
The date of the message is: Tue, 22 Mar 2016 16:35:22 +0000
The address to which the message has not yet been delivered is:
Delay reason: SMTP error from remote mail server after initial connection:
host mx.mnd.ukmail.iss.as9143.net [220.127.116.11]:
421 mx8.mnd.ukmail.iss.as9143.net bizsmtp Too many simultaneous sessions
I am getting about 2 or three of these a week on my meagre inbox alone. It is likely that many of us are suffering from this, as it seems your accept_max_value is too low, or you are poorly configured. Please could you tell us all what _you_ are doing to fix this.
[MOD EDIT: Personal and private information has been removed from this post. Please do not post personal or private information in your public posts. Please review the Forum Guidelines]