: Which company is responsible for emails deliverability when sent to a specific domain? We are experiencing troubles with an important provider that makes all our emails bounce. We tried a lot

Posted in: #Email

We are experiencing troubles with an important provider that makes all our emails bounce. We tried a lot of solutions to no avail, now we would like to contact the problematic ESP in question (ig.com.br)

A quick research on mxtoolbox makes it appear like they are using the services of "locaweb.com.br" :

mx:ig.com.br Find Problems mx
Pref Hostname IP Address
10 mx1.ig.correio.biz 177.153.23.241
Brazil BR
Locaweb Serviços de Internet S/A (AS27715)

However, locaweb denies being involved. As I don't understand very well how mxtools work, I'm not able to contradict them.

So can I confidently say on the base of this report that they indeed are in charge of dispatching the emails for ig.com.br?

My objective is just to contact anyone in the relevant organization, but I seem to have trouble even at step 0: determining what is the relevant organization

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@Nimeshi995

Keep in mind that this does not mean that even though an ISP controls an IP, does not automatically make them responsible for the server that IP points to. In this case, the IP that the MX records for ig.com.br are pointing to are definitely owned by them. Here's the DNS information for the MX records:

$ dig mx ig.com.br +short
10 mx1.ig.correio.biz.
20 mx2.ig.correio.biz.
20 mx3.ig.correio.biz.
20 mx4.ig.correio.biz.

Those domains point to the following IPs:

$ dig mx1.ig.correio.biz +short
177.153.23.241
$ dig mx2.ig.correio.biz +short
186.202.4.42
$ dig mx3.ig.correio.biz +short
187.45.217.20
$ dig mx4.ig.correio.biz +short
200.234.204.130

And those IPs are controlled by the following:

$ whois 177.153.23.241 | grep owner:
owner: Locaweb Servi?os de Internet S/A
$ whois 186.202.4.42 | grep owner:
owner: Locaweb Servi?os de Internet S/A
$ whois 187.45.217.20 | grep owner:
owner: Locaweb Servi?os de Internet S/A
$ whois 200.234.204.130 | grep owner:
owner: Locaweb Servi?os de Internet S/A

Locaweb may or may not control the server or servers that these IP addresses point to, but they are most certainly in control of those IPs, and where those IPs point to. I hope that helps!

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: Which company is responsible for emails deliverability when sent to a specific domain? We are experiencing troubles with an important provider that makes all our emails bounce. We tried a lot

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