Deliverability to hotmail.co.uk
Outlook.com’s o’er the pond UK sister, Hotmail.co.uk, is another Microsoft domain being phased out. While pre-transition users may keep their co.uk domain descriptors, all new users, worldwide, will have only Outlook.com as their email domain address.

Emails Sent to hotmail.co.uk: 16,658,092

Open Rate to hotmail.co.uk: 2,143,727 (12.9%)

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Sent vs Opens for hotmail.co.uk

Date Sent Opens Open Rate
1/25/2025 1,365 62 0.0%
1/24/2025 4,826 430 0.0%
1/18/2025 1,676 179 0.0%
1/17/2025 4,137 642 0.0%
1/16/2025 4,622 844 0.0%
1/15/2025 4,392 720 0.0%
1/14/2025 4,592 930 0.0%
1/13/2025 2,598 475 0.0%
1/12/2025 916 225 0.0%
1/11/2025 2,223 333 0.0%
1/10/2025 2,094 275 0.0%
1/9/2025 1,732 336 0.0%
1/8/2025 1,945 351 0.0%
1/7/2025 1,855 344 0.0%
1/6/2025 2,331 574 0.0%
1/4/2025 1,091 164 0.0%
1/3/2025 1,169 236 0.0%
1/2/2025 1,413 271 0.0%
1/1/2025 1,071 221 0.0%
12/31/2024 1,325 189 0.0%
12/30/2024 1,413 262 0.0%
12/29/2024 873 178 0.0%
12/28/2024 1,020 196 0.0%
12/27/2024 964 171 0.0%
12/26/2024 873 136 0.0%
12/25/2024 800 110 0.0%
12/24/2024 1,072 159 0.0%
12/23/2024 1,353 264 0.0%
12/22/2024 794 151 0.0%
12/21/2024 1,152 258 0.0%

Blocks from hotmail.co.uk

No blocks during specified time frame

Bounces from hotmail.co.uk

Explanation of bounce codes

Message Count
Invalid:550-MailboxUnavailable 280
550 5.5.0 Requested action not taken: mailbox unavailable . 127
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message Microsoft Unified Storage is full. Microsoft Unified Storage is full. 61
550 5.5.0 Requested action not taken: mailbox unavailable. 34
550-5.7.0 Mail relay denied . Invalid credentials for relay for 550-5.7.0 one of the domains in: . 550-5.7.0 Email is being sent from a domain or IP address which isn't 550-5.7.0 registered in your Workspace account. Please login to your Workspace 550-5.7.0 account and verify that your sending device IP address has been 550-5.7.0 registered within the Workspace SMTP Relay Settings. For more 550-5.7.0 information, go to 550 5.7.0 https://support.google.com/a/answer/6140680#maildenied 6
DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 2
NoMxRecord:0-0 2
550 5.4.300 Message expired -> 452 4.2.2 The recipient's inbox is out of storage space. Please direct the;recipient to; https://support.google.com/mail/?p=OverQuotaTemp 1

Methodology

Send and open statistics are updated daily. Bounces and blocks are updated in real-time. Every day, open statistics are updated for the last 14 days. Generally, you'll notice an increase of an open rate for a domain for a day over the course of 14 days, since not all open events occur the same day an email is sent. That means that open rate data is tied to the actual emails sent on a particular day.

Bounce and block codes are the codes as returned by the remote SMTP server after having been de-personalized. Meaning, unique identifiers present in SMTP codes are removed so that SMTP responses can be grouped for analysis. In certain cases, such as when the email is being relayed through an intermediary SMTP server, the remote SMTP server may not be the same as the MX record for the domain. SMTP codes are categorized as "bounces" vs "blocks" by internal human review. Bounces generally indicate an invalid email address. Blocks generally indicate a rejection of the email message but a valid email address.

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