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Deliverability to icloud.com

Sending volume, opens, bounce responses, and block messages observed by GMass for email sent 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 47,796,594 Messages represented in this domain dataset
Unique opens 8,886,406 Unique open events associated with those sends
Open rate 18.6% Across all available data for icloud.com
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Sent vs. opens

Change the date range or chart style. Bounce and block sections below follow the same selected date range.

Date Sent Opens Open rate

Blocks from icloud.com

SMTP responses that generally indicate a valid address whose message was rejected.

No blocks during the specified time frame.

Bounces from icloud.com

SMTP responses that generally indicate an invalid or undeliverable email address.

Bounce code guide
6,672 bounce events · 29 response types
  • 552 5.2.2 : user is over quota 4,219
  • 550 5.1.1 : user does not exist 994
  • Invalid:550-MailboxUnavailable 637
  • 554 5.7.1 Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137. 288
  • X-Postfix; Message delivery failed 191
  • 550 5.1.6 user no longer on system: 143
  • 550 5.1.1 : inactive email address 60
  • 550 5.2.1 user disabled; cannot receive new mail: 36
  • 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 28
  • 501 5.1.3 Bad recipient address syntax 16
  • Message rejected. For more information, go to https://support.google.com/mail/answer/69585 10
  • X-Postfix; 550 5.7.1 Message rejected due to local policy; if you feel that your email was rejected in error, please forward a copy to . 8
  • SMTP; 552 5.2.2 : user is over quota 7
  • aggressive-handler 6
  • 550-5.7.40 Your email has been blocked because the From: header in 550-5.7.40 this message isn't aligned with either the authenticated SPF or DKIM 550-5.7.40 organizational domain. To learn more about DMARC alignment, visit 550-5.7.40 https://support.google.com/a?p=dmarc-alignment 4
  • 552 1 Requested mail action aborted, mailbox not found 3
  • DNS Error. DNS type 'mx' lookup responded with code NXDOMAIN 3
  • 451 4.3.0 : Temporary lookup failure 3
  • 550-5.7.1 Gmail has detected that this message is likely 550-5.7.1 unsolicited mail. To reduce the amount of spam sent to Gmail, this 550-5.7.1 message has been blocked. For more information, go to 550 5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 2
  • The recipient server did not accept our requests to connect. For more information, go to https://support.google.com/mail/answer/7720 2
  • X-Postfix; unable to look up host jumboloans-ca.mail.protection.outlook.com: Name or service not known 2
  • Invalid:501-SyntaxError 2
  • 452 4.5.3 Error: recipient not found 2
  • 550 5.1.1 : Recipient address rejected: User unknown in virtual alias table 1
  • 552 5.3.4 Message size exceeds fixed limit 1
  • SMTP; 550-5.2.1 The email account that you tried to reach is inactive. For more 1
  • 554 Reject by behaviour spamANTISPAM_BAT: too frequently sending 1
  • 551 SenderAuthorization: is not authorized to send emails to this service. 1
  • SMTP; 554 5.4.0 Error: too many hops 1

Methodology

Send and open statistics

Send and open statistics are updated daily. Every day, open statistics are refreshed for the previous 14 days because not every open happens on the same day an email is sent. Open-rate data remains tied to the emails actually sent on each particular day.

Bounces and blocks

Bounces and blocks update in real time. SMTP responses are de-personalized so similar responses can be grouped for analysis. GMass categorizes responses through internal human review: bounces generally indicate an invalid address, while blocks generally indicate a valid address whose message was rejected.

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