Deliverability to icloud.com
iCloud.com is Apple’s all-encompassing cloud services hub, securing and managing users’ ever-growing data demands. Growing quickly, Apple’s iCloud domain added 68 million users during the two-year span that was 2016 to 2018.

Emails Sent to icloud.com: 47,796,594

Open Rate to icloud.com: 8,886,406 (18.6%)

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Sent vs Opens for icloud.com

Date Sent Opens Open Rate
1/25/202511,7691,59413.5%
1/24/202517,1373,86022.5%
1/18/202515,8761,99012.5%
1/17/202522,5575,24023.2%
1/16/202522,5025,04322.4%
1/15/202521,1135,13524.3%
1/14/202520,1375,85429%
1/13/202519,8954,84524.3%
1/12/202511,1002,41521.7%
1/11/202510,6172,22120.9%
1/10/202516,1844,37027%
1/9/202514,4943,55224.5%
1/8/202514,9984,13327.5%
1/7/202517,1664,75727.7%
1/6/202513,3284,07830.5%
1/4/20258,3931,23414.7%
1/3/202511,1412,93926.3%
1/2/202512,7223,60128.3%
1/1/20259,1482,23224.3%
12/31/202412,7103,35126.3%
12/30/202413,6303,98529.2%
12/29/20248,8511,98022.3%
12/28/202411,2802,95926.2%
12/27/202414,7612,54817.2%
12/26/20249,9442,13621.4%
12/25/202410,3532,64225.5%
12/24/202415,5795,33834.2%
12/23/202413,0914,40233.6%
12/22/20246,4921,55523.9%
12/21/20245,8381,58127%

Blocks from icloud.com

No blocks during specified time frame

Bounces from icloud.com

Explanation of bounce codes

Message Count
552 5.2.2 : user is over quota 2,857
550 5.1.1 : user does not exist 827
Invalid:550-MailboxUnavailable 611
550 5.7.1 Your email was rejected due to having a domain present in the Spamhaus DBL -- see https://www.spamhaus.org/dbl/ 98
550 5.1.1 : inactive email address 67
550 5.1.6 user no longer on system: 51
535 5.7.0 553 sorry, that password allowed relay 28
535 5.7.8 Error: authentication failed: 27
550 5.2.1 user disabled; cannot receive new mail: 10
550-5.1.1 The email account that you tried to reach does not exist. Please try 550-5.1.1 double-checking the recipient's email address for typos or 550-5.1.1 unnecessary spaces. For more information, go to 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser 8
550-5.2.1 The email account that you tried to reach is inactive. For more 550-5.2.1 information, go to 550 5.2.1 https://support.google.com/mail/?p=DisabledUser 4
501 5.1.3 Bad recipient address syntax 4
452-4.2.2 The recipient's inbox is out of storage space. Please direct the 452-4.2.2 recipient to 452 4.2.2 https://support.google.com/mail/?p=OverQuotaTemp 3
451 4.3.0 : Temporary lookup failure 3
X-Postfix; Message delivery failed 3
550 5.1.8 Access denied, bad outbound sender AS 2
DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 2
550 5.4.1 Recipient address rejected: Access denied. 1
550 5.2.1 Mailbox disabled, not accepting messages - freshmail 1
421 4.4.2 Error: timeout exceeded 1
mail action aborted: exceeded storage allocation exceeded. 552 For explanation visit https://postmaster.web.de/en/case?c=r1503&i=ip&v=17.58.23.185&r=1MjP5E-1t6Q6E3yig-00bKTq 1
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. 1
X-Postfix; Host or domain name not found. Name service error for name=isell.vegas type=A: Host not found 1
SMTP; 552 5.2.2 : user is over quota 1
NoMxRecord:0-0 1
554 5.2.2 mailbox full; Failed to process message due to a permanent exception with message The process failed to get the correct properties. 1.84300, 1.84300F000000, 1.84300:A1000000, 1.84300, 1.84300, 0.117068C000000, 1.79180, 1.79180F000000, 1.79180:FA000000, 0.73100, 5.95292, 8.111356F5F19C9441AE441A6536B31ED2F214BA6536B31, 0.38698F5F19C9, 1.41134, 7.36354C86000000, 1.41134, 7.36354C578A0FC6, 0.34102A159B, 5.29818D616230642D356264632D303030302D303030303030303030303030005F19C9, 5.55446A300074 1
550 Invalid Recipient 1
Invalid:501-SyntaxError 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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