The short answer

Email deliverability is your ability to reach the inbox, not merely hand a message to the receiving server. Spam placement usually comes from some combination of missing authentication, poor list quality, complaints, sudden sending changes, misleading messages, or weak engagement.

Start with the plumbing and the permission. Changing a few words in the email will not repair a damaged sending setup.

Separate delivery from inbox placement

Your email platform may report “delivered” when the receiving server accepted the message. That does not prove it reached the primary inbox. It may be in spam, a promotions tab, quarantine, or another filtered folder.

Check these signals together:

• hard and soft bounces.
• spam-complaint rate.
• unsubscribe rate.
• authentication results.
• inbox placement across major mailbox providers.
• clicks, replies, and conversions.
• changes by signup source or subscriber age.

If you send enough Gmail volume to receive data, Google Postmaster Tools reports spam rate, reputation, authentication, and delivery errors for mail going to personal Gmail accounts.

Fix problems in the right order

First, confirm that SPF, DKIM, and DMARC are set up correctly for every service that sends as your domain. Then make sure people knowingly joined your list, unsubscribing is simple, and suppressed addresses cannot be re-imported.

Google's current email sender guidelines require authentication for mail sent to personal Gmail accounts and add stronger requirements for bulk senders. They also emphasize easy unsubscribing, low reported spam, and sending only to people who want the messages.

Next, look for a specific change. Did you switch domains, import old contacts, triple your frequency, or send a campaign to everyone after months of silence? Sudden volume spikes and stale lists deserve attention before design details.

Finally, review the message itself. Use a recognizable sender name, an accurate subject, a visible unsubscribe link, and a reasonable balance of useful text and images. Test every link. Avoid fake reply prefixes, hidden content, and urgency that the body cannot support.

Run a practical deliverability check

Send the message to addresses you control at Gmail, Outlook, Yahoo, and any provider common among your customers. View the original message headers and confirm the authentication results show pass. Do not rely on a screenshot from the email editor.

Then send to a small group of recent subscribers. If that performs normally while old contacts fail, list age may be the issue. If one mailbox provider has trouble, investigate its requirements instead of changing the whole campaign blindly.

Don't ask subscribers to move you to the inbox as your only solution. Their action may help their individual mailbox, but it does not replace proper authentication or list care.

WAHMN's Email Marketing System is a useful next step if you want the technical setup, list practices, and campaign workflow to operate as one system.

Sources and further reading

• Google: Email sender guidelines
• Google: Set up Postmaster Tools

A free next step

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Helpful WAHMN article

For a worked example and more help with this topic, read Kit vs. MailerLite for a New Online Business: Which Should You Start With?.

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