Not receiving emails from Southwest Air; emails not blocked

For Outlook.com, this usually comes down to one of these causes:

1. Check whether the messages are being filtered elsewhere:
   • Check the Other tab.
   • Check the Junk Email folder and Junk Email settings.
   • Check whether messages are sorted oddly; restore chronological order with Filter > Sort > Date.
   • Check whether email forwarding is enabled.
   • Check whether any rules are moving or deleting the messages.
2. Check account state:
   • If the password was changed recently, update it.
   • If there was unusual sign-in activity, the account may be temporarily blocked. Use the Outlook.com account unblock flow.
   • If sign-in is failing, use the Microsoft account sign-in helper.
3. Check storage:
   • If Microsoft cloud storage is full, Outlook.com cannot send or receive email.
   • Messages sent while storage was full are bounced back to the sender and are unrecoverable.
4. If this is only happening with Southwest and Outlook.com is otherwise receiving mail:
   • Ask Southwest to confirm whether they are getting a rejection or non-delivery report.
   • If the sender is being rejected before the message reaches the mailbox, Safe Senders, rules, and blocked senders will not fix it.
5. If Outlook.com on the web is behaving oddly while checking mail:
   • Try Microsoft Edge or another browser.
   • Disable or exclude Outlook.com from ad blockers such as AdBlock or uBlock, then refresh.

Since access to the account is also failing, start with account sign-in and unblock checks first, then verify storage, then recheck Junk/Other/rules/forwarding.

References:

• Can't send or receive email in Outlook.com | Microsoft Support
• Fixes or workarounds for recent issues on Outlook.com | Microsoft Support
• Why am I not receiving emails from certain senders that I haven't blocked? - Microsoft Q&A
• Not receiving most emails all of a sudden - Microsoft Q&A