Apple

Apple Mail (also known as "Mail") is an email provider for customers of Apple, headquartered in California. Their postmaster includes some basic deliverability recommendations, but troubleshooting requires contacting their support team.

Domains

  • icloud.com
  • me.com
  • mac.com

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421All 421 codes →

smtp;421 4.7.0 me.com Error: too many errors

smtp;421 4.7.1 Messages to example@icloud.com deferred due to excessive volume. Try again later - https://support.apple.com/en-us/HT204137

Medium severity

451All 451 codes →

smtp;451 4.7.1 Service unavailable - try again later

Low severity

550All 550 codes →

smtp;550 5.1.1 <example@icloud.com>: user does not exist

smtp;550 5.7.1 [CS01] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137

smtp;550 5.7.1 Your message was rejected due to example.com’s DMARC policy. See https://support.apple.com/en-us/HT204137 for info

High severity

smtp;550 5.7.1 Your email was rejected due to having a domain present in the Spamhaus DBL -- see https://www.spamhaus.org/dbl/

Critical severity

552All 552 codes →

smtp;552 5.2.2 <example@icloud.com>: user is overquota

554All 554 codes →

smtp;554 5.7.1 <example@icloud.com>: Relay access denied

smtp;554 5.7.1 [CS01] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137

Medium severity

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