Microsoft email bounces stem from various factors including EC2/SES blocking, aggressive throttling, poor IP reputation, authentication failures (SPF, DKIM, DMARC), list hygiene issues, content triggering spam filters, sending volume spikes, and potential neighbor issues. Addressing these problems requires a multifaceted approach: review bounce messages, investigate sending practices, implement custom rDNS, maintain consistent volume with gradual IP warm-up, monitor SNDS and enroll in JMRP for feedback, improve email authentication, clean email lists, optimize content, segment emails for better engagement, and manage sending volume carefully.
11 marketer opinions
Microsoft email address bounces often stem from IP reputation, content triggering spam filters, and sudden sending volume spikes. Solutions include warming up IPs, email authentication (SPF, DKIM, DMARC), list cleaning, content review, sender reputation monitoring using SNDS/JMRP, personalized segmentation, and gradual volume increases.
Marketer view
Email marketer from DigitalMarketer explains that to improve email deliverability, focus on segmentation and personalization. Sending relevant content to specific segments of your audience can improve engagement and reduce bounce rates. Avoid sending the same generic email to your entire list.
5 Feb 2022 - DigitalMarketer
Marketer view
Email marketer from EmailOversight shares that issues with Microsoft email addresses often stem from reputation issues. They recommend using Microsoft's JMRP program to receive feedback on spam complaints, ensuring your sending IPs aren't on blocklists, and proactively managing your sender reputation.
18 Jul 2023 - EmailOversight
5 expert opinions
Microsoft email bounces are often caused by sending from EC2/SES, aggressive throttling, poor IP reputation, and neighbor issues. Address these by reviewing bounce messages, investigating customer sending practices, using custom reverse DNS, maintaining consistent volume, monitoring SNDS, enrolling in JMRP, and addressing complaints promptly.
Expert view
Expert from Spam Resource explains that Hotmail/Outlook is notorious for aggressive throttling, especially for new IPs or sudden volume increases. Consistent volume and gradual warm-up are essential.
15 Feb 2023 - Spam Resource
Expert view
Expert from Email Geeks explains that Microsoft may block email sent from EC2 or SES. It is important to look at bounce messages, investigate customer sending practices, and consider custom reverse DNS. If complaints are low, mail might be going to spam. Custom rDNS can clarify dedicated IPs to Amazon, reducing spillover from neighbors and confirming the source of issues.
13 Aug 2023 - Email Geeks
4 technical articles
Microsoft email bounces are often caused by incorrect email addresses, recipient server issues, SPF failures, and email spoofing. Addressing this involves reviewing bounce message error codes, monitoring IP health via SNDS, and implementing correct SPF and DMARC records to authorize sending servers and prevent spoofing.
Technical article
Documentation from RFC explains that SPF records specify which mail servers are authorized to send emails on behalf of your domain. Incorrect or missing SPF records can cause Microsoft and other email providers to reject emails from your domain, leading to bounce messages.
1 Sep 2023 - RFC
Technical article
Documentation from DMARC.org explains that implementing DMARC helps prevent email spoofing and phishing attacks. It allows you to specify how receiving email servers should handle emails that fail SPF or DKIM checks, reducing the likelihood of your emails being marked as spam or rejected.
12 Jul 2021 - DMARC.org
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