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emaildelivery
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503 rate limiting - who to contact?

I work for an email service provider and one of our customers is receiving constant bounces of the format "503 Hourly ratelimit for your IP exceeded". 

I haven't been able to find any details on how many concurrent connections or how many messages per connection are accepted by VM servers. Where can I find this information?

Thanks!

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用心棒
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Re: 503 rate limiting - who to contact?

Flagged to the forum team as they are best placed to take this forward; be aware it can take them a few hour / days to respond.

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Paul_DN
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Re: 503 rate limiting - who to contact?

Hi, 

 

Thank you for reaching out to us in our community, in order to try to get to the bottom of this there is a few things from them to check.

 


1. Is it always to the same addresses
2. Is it always within the same hour - if they wait until the next hour can they then send to those addresses
3. If it is to all addresses then if they wait until the next hour are they then able to send to those addresses

1 and 2 together indicate that it is the recipient's ISP or some other point at their end (SPAM firewall?) that has the restriction.


3 indicates that it is probably either their ISP or other point at their end end (SPAN Firewall?) with the restriction.

 

Kind regards

 

Paul.

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emaildelivery
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Re: 503 rate limiting - who to contact?

The bounces occur anytime mail is sent to a recipient at ntlworld.com, virginmedia.com, virgin.net, blueyonder.co.uk or any other Virgin Media domain. This would seem to indicate Virgin Media is the one throttling the mail. Here is the format of the SMTP responses:

421 4.1.1 logid=SMTPRC 421 MXIN503 Hourly ratelimit for your IP exceeded ;id=AWVhjLA2wxWCGAWVijB69A;sid=AWVhjLA2wxWCG;mta=mx11.tb;d=20200307;t=111646[CET];ipsrc=xx.xx.xx.xx

 

Thanks,

Brad 

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John_GS
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Re: 503 rate limiting - who to contact?

Hi emaildelivery,

 

Thanks for posting and welcome to the community. Sorry for the service issue and the delayed reply. 

 

I've emailed our internet security team regarding this matter and when I hear back, I'll let you know.

 

Kind regards,

John_GS
Forum Team

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