On 2024-05-06 Montana Quiring wrote:
Hello,
Anyone had any issues with sending to Shaw email addresses recently? I have a client that sends out smallish batches of emails once every week or so, and last week a number of them we blocked, but some went through. Never had this happen before.
-shawuser1-@shaw.ca: host shw-central.mx.a.cloudfilter.net[15.222.199.59] refused to talk to me: 554 shw-ibgw-4002a.ext.cloudfilter.net cmsmtp 72.29.89.5 blocked AUP#BL
"blocked...BL" means your client has their IP (though could be their domain) on an email blocklist. Maybe one named "AUP"?
There are websites that let you put in your IP and see what BLs you're on. Give that a try. Then you can contact the offending BLs to try to get off.
Looks like (from the above debugs) Shaw is outsourcing this job to cloudfilter. But the root BL cause is the avenue to attack first.
But you're in luck! Tomorrow (Tues) is MUUG night and I'm presenting on the tech that all these "Big Email" guys want you to use. Implementing what I'm going to present may help with your client's deliverability by improving their overall score (though BLs can be a slightly different beast, all these things are related).
We haven't seen you in forever, Montana, so come check us out (or online)! :-)
Hartmut:
Your case would be slightly different since you are getting drops, not bounces. Your case could be more related to what I'm going to present than Montana's. All the Big Email companies are making life extremely difficult for little senders and huge senders alike. The Borg demands its sacrifices!! :-)