Hi, I'm experiencing a similar problem. Did you get a reply or found a solution?
The IP is only used to send invoice emails to customers. Basically 3 lines of text + attached pdf. Very low volume ( less than 1.000 invoices per month are sent to @outlook.com ). I've been in contact with Outlook.com Deliverability Support Team and they usually reply with "We have implemented mitigation for your IP" standard message. But the IP is blocked a few hours/days after the mitigation or the messages are silently discarded, meaning that they are accepted by their servers but never delivered to the user, not even to the Junk folder. Em qua., 26 de mai. de 2021 às 00:48, Rob Golding via mailop < [email protected]> escreveu: > Hi > > Could someone from outlook.com filtering contact me to help dig a bit > deeper into a mail bounce issue ? > > Client is getting valid mail (invoices etc to longstanding customers) > rejected claiming server/ip is blocked but investigations through all > the usual methods report it's not blocked (but it definitely is) > > Not seen anything obvious that would imply it should have been blocked > at all, and multiple "there is no block" responses make me think > something has gone awry somewhere > > Thanks > Rob > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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