Not Receiving Expected Emails

Question

You might experience the problem that someone send you an email but the message never reaches your inbox. You already double checked with the sender and she/he is pretty sure about the address entered.
Now, what’s next?
Actually, there are lots of scenarios in which this issue could happen. You can start checking your Outlook client thoroughly and confirm whether the message really does not make it to the Outlook client first.
Junk E-Mail, Deleted Items folder
Whenever you cannot found some mail items, do check the
Junk E-Mail/Deleted Items folders first. Sometimes mail will be classed as SPAM by
Outlook Junk Email Filteror
3rd party anti-spam tools, then be placed or deleted in
Junk E-Mail/Deleted Items folders because of where it came from, or the contents.
Expand and check subfulders
If you have any subfolders under your root folder, try to expand and check all of them, or simply do a search in the mailbox. This seems obvious but can be easily overlooked, a corrupted or hidden rule might be moving your mails.
Disable 3^rd party virus scanner
It is really not recommended to install a virus scanner for your Outlook. This might sounds strange, but it has been proved that virus scanner will cause lots of issues in Outlook.
So if you have an email virus scanner, you can disable the module within your anti-virus program’s Options dialog. Or contact your ntivirus software vendor to determine how to configure software to exclude any integration with Outlook.
After that, you can have the sender send another test message and see if message arrives this time.
Check the Outlook Blocked sender list
When a sender’s name or email address has been added to your Blocked Sender List, any messages from that particular address will be blocked.
You can check this by going to Home > Junk
> Junk E-mail Options > Blocked Senders tab:
Are you checking messages on multiple devices?
Nowadays, lots of persons are viewing mail messages across multiple devices, like tablet, smart phone, etc. If this is the case for you, then you might want to check all of them and see if the messages have arrived on any of them.
When you are using a POP3 account, please note that you have to configure all the devices to
leave a copy of message on the server, so that all your mail clients have a chance to download the same messages.
This option usually can be set on the Account Settings dialog. Take Outlook 2013 as example here, go to
FILE > Account Settings > Account Settings…
> Double click your POP3 account > More Settings…
> Advanced tab:
Check on Web-based mail portal
If you still cannot find the message after going through all steps above, then it’s time to check your web mailbox. You should contact your ISP for the correct address if you don’t know.
If the message shows up in the web based mailbox, then the message does make it to your server. This usually indicates a sync issue between the Outlook client and your mail server. Maybe an issue with your current Outlook configuration,
you might want to check your email account settings.
Server side filter
Lots of email services provide a Junk E-mail functionality on server side, for example, Outlook.com has its own Junk Mail Settings:
Something in the messages might triggered the spam filter, and caused the message be deleted on server level. Hence Outlook never got a chance to download it. You can adjust the filter level or completely disable it, then try again.
Request the sender to check on his/her side
If it is convenient, you can request the sender to do more test on his/her side. Ask him/her to send the same message to another address and see if it will arrive.
Also check if the sender receives any NDR (Non Delivery Receipts) messages. If yes, analyze the message for more details about the delivery failures, it usually
contains some additional information.
For more information about NDRs, see the following Microsoft TechNet topics:
Understanding DSNs and NDRs
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Answer 1

Login to the site, change your password, make sure that it (as a minimum) has 8 characters including 1 capital letter and 1 number, put the new password in all of your devices accessing the site.