Microsoft refuses to ask RBL sites to delist Office 365 server IP addresses | TechToys

Where Techies come to Talk

Microsoft refuses to ask RBL sites to delist Office 365 server IP addresses

Recently many of our clients have reported that outgoing Office 365 emails were going into SPAM or Junk folders at the client end. This is bad for business and bad for the reputation of a company.
As a user of Office 365 we asked Microsoft for help. Below is there response.

Microsoft has a duty and a responsibility to keep Office 365 IP addresses off any and all blacklists.

Judge for yourself whether Microsoft cares about customer service.



From: Microsoft Customer Support
Sent: Tuesday, July 19, 2016 7:40 PM

Subject: RE: SRX616071991665777ID – Office 365 Server is on a Block List

Hello Jonathan ,

This is Anubha, I am a Support Escalation Engineer.

Issue:- Microsoft IP blacklisted on Lash back.

Issue related Explanation:- The mail coming from Microsoft is RFC compliant. If the recipient is making a conscious decision to use this block list. Therefore, Microsoft does not pursue delisting with this company Lash back.
Please keep in mind that we have no affiliation with Lash back and therefore we don’t have much say in what IPs they block or don’t block.

Possible Solution: You can ask the mail companies to be careful when using Lash back database in their system.
All that can be done at this point is asking the intended recipient to whitelist your email address or domain “”. Or they can stop using the product that is purposely blocking your email.

Related Explanation for the issue:-
At any time an RBL developer can add any IP to their block list with or without reason.
As a matter of fact, some RBL’s actually charge a fee to be removed from their list.
Microsoft will not encourage this process. .
As always, Microsoft is committed to enabling our customers with a secure email environment that is both spam- and virus-free.
As part of that commitment, Exchange Online Protection Filtering takes numerous steps to ensure that e-mail filtered through our network does not contain unsolicited commercial e-mail.
In rare cases, servers associated with the EOP network may be listed on the Lash back.
Because EOP is a relay, mail goes through it to end up in customer MTAs which will sometimes reject the message.
When that happens, EOP must generate a new NDR message and deliver it back to the “sender”. Some of these will be backscatter bounces.
The recipient is choosing to block it just as they would as if they made a local Exchange rule to block email from your domain.
There is nothing Microsoft can do to FORCE an intended recipient to accept specific mail. In this case they are using an RBL but it might as well be a local Exchange policy blocking it. The recipient is choosing to do this.

Post a Comment

Your email address will not be published. Required fields are marked *

  • Categories

  • Tags

  • Archives