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Emails are throttled by virginmedia

Hello,

We are trying to solve connection issues with virginmedia domains - ntlworld.com, blueyonder.co.uk, virginmedia.com, virgin.net

We have 3,5 million transient errors in the last 7 days while trying to connect to the domains mx records. Emails are delivered in the end, but we always have either connection errors or throttling. IPs are not blacklisted.

domain: virginmedia.com
dsnStatus: 4.4.2 (bad connection)
dlvDestinationIp: 212.54.56.11
dsnMta: mx.tb.ukmail.iss.as9143.net
timeLogged: 2020-11-02T14:14:11+01:00

domain: ntlworld.com
dsnStatus: 4.4.2 (bad connection)
dlvDestinationIp: 212.54.56.11
dsnMta: mx.tb.ukmail.iss.as9143.net
timeLogged: 2020-11-02T14:31:01+01:00

domain: blueyonder.co.uk
dsnStatus: 4.4.2 (bad connection)
dlvDestinationIp: 212.54.56.11
dsnMta: mx.tb.ukmail.iss.as9143.net
timeLogged: 2020-11-02T18:16:57+01:00

domain: virgin.net
dsnStatus: 4.4.2 (bad connection)
dlvDestinationIp: 212.54.56.11
dsnMta: mx.tb.ukmail.iss.as9143.net
timeLogged: 2020-11-03T08:04:15+01:00

In most cases we cannot even connect and it ends with "bad connection" error from the logs above, but we also notice such errors:

smtp;421 4.2.0 MXIN605 Too many spam emails from your IP in the last hour. Fix and retry later ;id=ZqMYko1jr99KiZqMYk5IUd;sid=ZqMYko1jr99Ki;mta=mx7.tb;dt=2020-11-03T08:04:15+01:00

Are there any throttling rules we could apply to solve the issue? 

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Re: Emails are throttled by virginmedia

Here are the general guidelines -

https://www.virginmedia.com/help/virgin-media-mail-how-to-send-bulk-emails

Like many ISPs VM may well throttle emails from any given source if the volumes exceed operational limits. Such limits are truly variable dependant upon network loads etc and you are therefore unlikely to be told of specific numbers for hourly/daily/weekly limits.

I am a VM customer and have pointed you at the published information on the subject. You can wait here for a formal response from the VM Forum Team in due course.

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Re: Emails are throttled by virginmedia

Hi BillC45,

thank you for your insight. 

We follow the email best practices, and I agree that usually ISPs are not sharing exact numbers on their limits, but in most cases approximate values are provided which can help to optimize the mail sending infrastructure. 

There are many cases as well when something should be adjusted from the ISP's side, like increasing thresholds for particular IP ranges, so I would be happy, if someone from VM could have a look.

 

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