Emails not landing in Outlook inbox since May 19/20 Office 365 security update

[KenB05797]

I'm told a recent O365 update has blocked Constant Contact emails from landing in Outlook inboxes.  My last campaign went from a 55% open rate to a 12% open rate. Tech support tells me they are aware of the issue but don't have a solution. This is an update on the O365/Outlook end that affects the ability of an email landing in the inbox.  Some are getting through to Spam/Junk but most show up as delivered but never arrived.  What is being done on this?  If there is no solution in sight I'm going to need to move to a different ESP.

[William_A]

Hello @KenB05797 ,

Here are some general best practices for deliverability.

Deliverability can have a lot of variables, from elements on our side, on your side, on the recipient's side, and in their email system company's side. It's also a generally good idea to set up additional authentication for your emails - particularly self-authentication since you have your own domain.

If you'd like to learn more about safelisting, and what it entails:

Safelisting domains in a security system

Safelisting email addresses in an email client or security system

If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Deliverability agents, like the chat agent you spoke with suggested.

[KenB05797]

This did not answer my question and a conversation with a Delivery Agent left me with the distinct impression there was nothing you could do to resolve the O365/Outlook Security issue. I'm exploring a different email client to replace Constant Contact.