Why are Gmail users not receiving order confirmation emails?

Key findings

• Gmail's filtering behavior: Gmail rarely bounces emails outright unless there are severe, persistent issues. Instead, it prefers to route them to spam, junk, or other inbox tabs, or apply throttling to delay delivery. This means an ESP reporting 'delivered' doesn't guarantee inbox placement.
• Transactional vs. marketing email treatment: Gmail is sophisticated enough to distinguish between different mail streams, treating order confirmations, marketing emails, and password resets based on their individual sender reputations and content. This can lead to issues with one type of email while others deliver fine.
• Throttling as an indicator: If emails are taking longer to arrive, it could be a sign of throttling due to IP volume load or a decline in mail stream reputation, even without outright rejections or spam placement.
• User awareness: Many users, especially those expecting crucial transactional emails, do not routinely check their spam or promotions folders, leading to customer service inquiries.

Key considerations

• Proactive testing: Regularly test the inbox placement of your transactional emails to various Gmail accounts, including new ones, to determine if they are landing in the inbox, spam, or other tabs.
• Customer guidance: Advise customers to check their spam, junk, or promotions folders and to move your email to their primary inbox. Also, encourage them to add your 'from' address to their address book.
• Monitor delivery delays: While Postmaster Tools might not show explicit rejections, monitor any increase in delivery time for your messages. You can use tools like Google Postmaster Tools to check reputation and delivery metrics more closely.
• Reputation deep dive: Investigate your sending IP and domain reputation more deeply, looking for subtle signs of degradation that might affect Gmail's filtering.

Key opinions

• Open/click rate analysis: A primary concern is whether open or click rates for affected emails have recently changed, indicating a potential shift in inbox placement.
• Spam folder assumption: The immediate assumption when emails are not received, but not bounced, is that they are landing in the recipient's spam, junk, or social/promotions tabs.
• Customer self-help: Encouraging customers to check their spam folders and to move emails out of spam is a frequently suggested solution.
• Whitelisting strategy: Many marketers suggest adding the sender's email address to the recipient's address book to improve deliverability.
• ESP reporting limitations: Despite ESPs reporting successful delivery, marketers often find discrepancies when customers report non-receipt.

Key considerations

• Understanding 'delivered': It's important to recognize that an email being 'delivered' by the ESP does not automatically mean it reached the primary inbox. It could still be in spam or other folders, leading to customers reporting that they are not appearing in the inbox.
• Customer support script: Develop clear instructions for customer service teams to provide to users, guiding them through checking spam folders and adding sender addresses.
• Internal testing: Beyond external complaints, send test emails to your own Gmail accounts to verify inbox placement directly.
• Segmented troubleshooting: When troubleshooting, focus specifically on the transactional email stream, as its deliverability can differ from other email types.
• Holistic spam prevention: Review broader strategies for avoiding spam filters, as even transactional emails are not immune to general spam-triggering factors.

Key opinions

• Gmail's filtering preference: Gmail typically adjusts mail flow to spam rather than outright bouncing messages, unless the sender has been ignoring issues for a significant period.
• Mailstream segregation: Gmail is highly effective at distinguishing between various email streams, meaning it can handle order confirmations, marketing messages, and password resets independently based on their unique reputation.
• Throttling insights: A key indicator of an issue can be emails taking longer to deliver, which points to throttling by Gmail due to factors like IP volume load or overall mail stream reputation.
• Direct testing importance: It is crucial to test order confirmations to personal and newly created Gmail accounts to accurately assess where the emails are landing (inbox, spam, or elsewhere).
• Sender address book advice: Advising recipients to add the sender's 'from' address to their address book is a simple, effective way to improve inbox placement.

Key considerations

• Beyond bounce rates: Do not solely rely on low bounce rates from your ESP, as Gmail often diverts mail to spam instead of bouncing it. The absence of a bounce doesn't mean inbox success.
• Identify throttling: If emails are experiencing delivery delays, investigate potential throttling issues, which can be a precursor to deeper deliverability problems. Learn how to resolve slow email delivery to Gmail.
• Authentication standards: Ensure your email authentication, including SPF, DKIM, and DMARC, is correctly configured and aligned to build sender trust with Gmail.
• Consistency in sending: Maintain consistent sending volumes and practices for your transactional stream to avoid triggering new filters or reputation penalties.
• Review email setup: Regularly review your overall email sending setup to catch any unintended changes that could impact deliverability for specific email types.

Key findings

• Authentication standards: Official guidelines stress the fundamental role of correctly configured SPF, DKIM, and DMARC records for establishing sender authenticity and trust with email providers.
• Sender reputation metrics: Documentation emphasizes that a strong sender reputation, built on factors like low spam complaints and high engagement, is paramount for inbox placement, regardless of email type.
• Engagement signals: Positive user interactions, such as opening emails, clicking links, and moving messages from spam to the inbox, are crucial signals that positively influence sender reputation.
• Content relevance: For transactional emails, maintaining concise, relevant content without marketing-like elements is advised to prevent triggering spam filters.
• Diagnostic tools: Mailbox providers offer tools, such as Gmail's Postmaster Tools, to give senders insights into their email performance and help in troubleshooting deliverability issues.

Key considerations

• Adherence to guidelines: Even for transactional emails, senders should comply with Gmail's bulk sender guidelines, as these often influence overall deliverability.
• Feedback loop monitoring: Actively monitor feedback loops to identify and promptly remove recipients who mark your emails as spam, which is crucial for maintaining a healthy sender reputation.
• Dedicated sending infrastructure: Consider using separate IPs or domains for transactional emails versus marketing emails to ensure that any issues with one do not impact the other, helping to mitigate deliverability delays and spam placement issues.
• List hygiene: Implement robust processes for managing bounces and invalid addresses, as sending to unengaged or non-existent recipients can quickly degrade sender reputation.
• HTML and formatting: Ensure your email templates are well-coded and render correctly across all email clients to provide a consistent, professional experience and avoid spam triggers.