Why has Microsoft email deliverability suddenly decreased and how can it be fixed?

Marketer from Email Geeks says they experienced similar deliverability issues with Outlook around the same time. They also suggest looking at email headers, specifically the `X-Microsoft-Antispam` setting.

Email marketer from Reddit shares that Hotmail/Outlook deliverability issues are often due to sender reputation problems. To resolve this, monitor SNDS data, address user complaints, and follow Microsoft's guidelines. Gradual warm-up after significant volume changes can also help.

Email marketer from EmailGeek shares that if Microsoft Outlook is blocking emails, ensure your sending IP isn't blacklisted. Use online tools to check and take the necessary steps to get delisted if needed. Also check email content and ensure its not triggering any spam filters.

Email marketer from SendPulse shares that ensure you are not on any blacklists by checking your IP address and domain on various blacklist monitoring sites. Remove any spam traps from your email list. Create engaging, relevant content to encourage recipients to mark your emails as 'not spam'. Regularly clean your list by removing inactive or invalid addresses.

Email marketer from Deliverability.org explains that sudden drops can stem from changes to Microsoft's filtering algorithms, increased spam complaints, or shifts in user engagement. To address this, he suggests verifying sender reputation, reviewing email content for spam triggers, authenticating email using SPF, DKIM, and DMARC, segmenting lists, and monitoring feedback loops.

Email marketer from Gmass shares that landing in the Outlook spam folder can be due to several factors: poor sender reputation, low engagement, spammy content, or incorrect authentication. To fix this, clean your email list, improve engagement by sending relevant content, and ensure proper email authentication.

Marketer from Email Geeks shares that many people are experiencing content-related deliverability issues and that big seasonal spikes in volume have been a problem at Microsoft for years.

Marketer from Email Geeks suggests that if the volume spiked and brought it back down and it hasn’t improved for a couple of weeks, submit a ticket to Hotmail.

Email marketer from Stackoverflow shares that one should set up SPF, DKIM, and DMARC records in your DNS settings. Monitor your sender reputation using Microsoft's SNDS program. Ensure your content is relevant and engaging to avoid spam filters. Always include an easy unsubscribe option in your emails. Regularly clean your email list to remove inactive or invalid email addresses. Gradually increase your sending volume to establish a positive sending history.

Email marketer from Mailjet shares that to improve deliverability with Microsoft, it's important to maintain a clean email list, authenticate emails, monitor IP reputation, and avoid spam triggers in content. They also stress the importance of respecting user preferences and providing easy unsubscribe options.

Expert from Email Geeks shares that several people have reported delivery issues at Microsoft around the same time and that Microsoft may be tuning things, impacting those with borderline deliverability.

Expert from Spam Resource explains that sudden email deliverability issues can often be traced back to changes in mailbox provider filtering rules, which might require senders to adjust their sending practices or content. He highlights the importance of closely monitoring deliverability metrics and maintaining good list hygiene.

Expert from Email Geeks suggests if the data shown is probe account data, then Katie is slowly moving into spam from the inbox and suggests looking at data hygiene, checking for new/reputable providers/CDNs, and checking if there were un-opted in addresses in the new data. Also to look at infrastructure setup, such as shared IPs or List-Unsubscribe domains.

Expert from Word to the Wise responds that Microsoft sometimes adjusts spam filtering in ways that cause temporary deliverability problems. She suggests reviewing sender reputation and working to fix the problems that are the cause, but if everything is fine, the problem will resolve itself. This takes the appropriate action to avoid more deliverability problems.

Documentation from DMARC.org explains that DMARC is crucial for enhancing email deliverability by preventing spoofing and phishing attacks. Implementing DMARC helps establish trust with email providers like Microsoft, improving the likelihood of emails reaching the inbox. Setting up DMARC involves creating a DMARC record in the DNS and monitoring reports to identify and address authentication issues.

Documentation from Microsoft Postmaster explains that delivery issues to Outlook.com can arise from poor sender reputation, high complaint rates, or authentication problems. They advise senders to join the SNDS (Smart Network Data Services) program to monitor their IP reputation, adhere to best practices for email sending, and implement feedback loops to handle complaints effectively.

Documentation from SparkPost explains that Microsoft actively filters email based on sender reputation, content, and user engagement. Senders should implement authentication protocols (SPF, DKIM, DMARC), monitor their sending reputation, and ensure their content is relevant and engaging to avoid being flagged as spam.