Barracuda

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421All 421 codes →

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smtp;421 Temporary failure, please try again later.

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422All 422 codes →

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smtp;422 License Expired

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450All 450 codes →

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smtp;450 cuda_nsu 4.7.1 <email@example.com>: Recipient address rejected: Policy Rejection- Abuse. Go away.

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451All 451 codes →

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smtp;451 4.7.1 <email@example.com>: Recipient address rejected: Greylisted for 5 minutes

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smtp;451 4.7.1 Try again later

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550All 550 codes →

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smtp;550 cuda_nsu 5.1.1 <email@example.com>... User unknown

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smtp;550 No such user (email@example.com)

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smtp;550 Blocked

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smtp;550 rejecting spoofed message

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smtp;550 cuda_nsu 5.4.1 [email@example.com]: Recipient address rejected: Access denied [example.com]

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554All 554 codes →

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smtp;554 rejected due to spam URL in content

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smtp;554 rejecting banned content

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