Hello there @StarB77 ,
We're sorry to hear you're experiencing deliverability issues to Outlook. There are several steps you can take to better your deliverability and make sure that you're not being accidentally snagged by Outlook or Office 365's security algorithms.
Adding email addresses to safe senders lists
Whitelisting in security programs
Unblocking Constant Contact Emails for Contacts
You may also want to call into our Deliverability team to discuss what steps you can take to improve delivery rates overall. They will have better tools for testing and troubleshooting delivery, and will be able to provide more specific advice if there is a particular element affecting your deliverability.
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