Specific Email Account Stopped Arriving

Question

Specific Email Account Stopped Arriving

Randy Bauld 20

I have a friend with a specific @sio.midco.net email account that will not deliver to my @hotmail.com address.

I can send an email to this account, they reply, but I do not receive. The last successful email received from the @sio.midco.net was on July 29, 2026. The @sio.midco.net account new message sent to my @hotmail.com address will also not deliver.

The individual @sio.midco.net email account is in my @hotmail.com safe senders list as well as the full domain sio.midco.net.

The @sio.midco.net email administrator is telling me that the emails are leaving the @sio.midco.net account destined for @hotmail.com address.

Thank you in advance for any suggestions you can recommend.

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Answer 1

Chloe-V 12,710 Microsoft External Staff Moderator

Hi Randy Bauld

I understand how frustrating this must be, especially since emails from this sender were delivered successfully until July 29, 2026, and you have already added both the individual address and the sio.midco.net domain to your Safe Senders list.

Since you can send messages to this person and receive their replies, but newly composed messages from that specific account do not arrive, please first search for the sender’s full email address in Outlook.com and select All folders. Also check Junk Email, Deleted Items, Archive, and the Other tab if Focused Inbox is enabled.

Next, go to Settings > Mail > Rules and make sure no rule is moving or deleting messages from this sender. Please also check whether a Sweep action was previously applied. Under Settings > Mail > Junk email, confirm that neither the sender’s address nor the sio.midco.net domain appears in the Blocked senders and domains list.

If the messages are not in any folder, please ask the sender’s email administrator to check the delivery log for a recent test message and provide the final SMTP response from Microsoft, along with the date and time sent, message ID, and any rejection or delayed-delivery notice. A record showing only that the email left their server does not confirm that Outlook.com accepted it.

If the log shows that Microsoft rejected or delayed the message, the sender’s administrator will need to investigate the sending server’s configuration and reputation and contact Microsoft Support if necessary.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

I hope this helps identify whether the message is being redirected inside the mailbox or stopped during delivery. Please feel free to let us know what the sender’s administrator finds.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Randy Bauld 20 Reputation points

2026-08-10T10:53:21.5033333+00:00

Hi Chloe,

Thank you for the response. I have corrected the first part of your second paragraph below.

"Since you can send messages to this person but do not receive their replies and their newly composed messages from that specific account also do not arrive in @hotmail.com,"

I will work on items listed in paragraphs 4 and 5 to see what I can receive from @sio.midco.net email administrators. I have been a network engineer for 29 years, so this item is perplexing.

Thank you.
[Moderator Note: Personal Info Removed]
Chloe-V 12,710 Reputation points Microsoft External Staff Moderator

2026-08-11T06:49:00.65+00:00

Hi Randy Bauld

Thank you for the clarification, and I apologize for misunderstanding that detail in my previous response.

Have you had a chance to obtain the delivery log, final SMTP response, or message ID from the sio.midco.net email administrator?
Randy Bauld 20 Reputation points

2026-08-11T10:59:17.73+00:00

Hi Chloe,

I didn't get a chance to contact the sio.midco.net administrator yet. The sio.midco.net emails started arriving yesterday. Some with a 5 hour delay from the time they were sent. One had a 17 hour delay delivery according to the time it was sent and finally received.

I will post an update later tonight or early Wednesday.

Thank you for your responses.
Chloe-V 12,710 Reputation points Microsoft External Staff Moderator

2026-08-12T00:11:04.2+00:00

Hi Randy Bauld

Thank you for the update. Please feel free to post another update once you have more information, and we'll be happy to continue assisting.
Randy Bauld 20 Reputation points

2026-08-12T10:45:17.43+00:00

Hi Chloe,

I was able to confirm that @sio.midco.net administrators that they were having email delivery issues. I also found out that the @sio.midco.net provider will be getting out of the email hosting business in the near future. As a result my @sio.midco.net friend, who originally experienced the delivery issues, is in the process of moving to a different free email hosting company.

Thank you again for your responses.
Chloe-V 12,710 Reputation points Microsoft External Staff Moderator

2026-08-13T06:35:09.31+00:00

Hi Randy Bauld

Thank you for the update and for confirming the cause of the issue.

Thank you again for sharing the outcome with the community.