Missing emails are frustrating but usually traceable to one of a few common causes. Work through these before assuming a message was never sent.
Check your spam or junk folder
This solves the majority of “missing email” cases. Spam filters occasionally misclassify legitimate senders, especially new contacts or promotional-sounding subject lines. See our guide to how spam filters work for why this happens.
Check for filters or forwarding rules
If you or someone else previously set up a filter or forwarding rule, incoming mail matching that rule may be silently moving to a folder or a different address without appearing in your main inbox. Review your account’s filter settings for anything unexpected.
Check if your mailbox is full
When a mailbox reaches its storage limit, new incoming mail is often rejected entirely rather than just failing to display. Check your storage usage and clear out old large attachments if you’re near the cap.
Confirm the sender used the right address
A simple typo on the sender’s end will mean the message never reached you at all, and often the sender won’t realize it unless they receive a bounce notification. Confirm your exact email address with them.
Allow for sync delays
Mobile apps sometimes sync on a delay rather than instantly, especially with a weak connection. If a message is truly urgent and missing, checking via a web browser can rule out an app-specific sync issue.
Frequently asked questions
How often should I check my spam folder?
A quick glance every few days is reasonable, especially if you’re expecting mail from a new or unfamiliar sender.
Could someone else’s forwarding rule affect my inbox?
Only if it was set up on your own account. Check your own filter and forwarding settings if mail seems to be disappearing.
Why would a mailbox reject new email instead of just showing ‘full’?
Once storage is completely used, some mail servers refuse new incoming messages outright rather than accepting and displaying an error, since there’s nowhere to store them.