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421All 421 codes →

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smtp;421 4.1.1 <email@example.com>: Recipient address rejected: unverified address: host example.com[x.xx.xx.xx] said: 450 4.1.1 <email@example.com>: Recipient address rejected: unverified address: lost connection with mail.example.com[x.xx.xx.xx] while sending RCPT TO (in reply to RCPT TO command)

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smtp;421 4.1.1 <email@example.com>: Recipient address rejected: unverified address: Address verification in progress

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550All 550 codes →

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smtp;550 5.1.1 <email@example>: Recipient address rejected: User unknown

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smtp;550 5.1.1 <email@example.com>: Recipient address rejected: undeliverable address: host example.com[x.xx.xx.xx] said: 550 5.1.1 <email@example.com>: Recipient address rejected: undeliverable address: host example.com[x.xx.xx.xx]

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smtp;550 5.1.1 User Unknown

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smtp;550 5.1.1 - This is not a valid email address. Please verify that you have the correct email address for your recipient.

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smtp;550 5.7.1 <email@example.com>: Recipient address rejected: User email address is marked as invalid.

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smtp;550 5.7.1 Relaying denied

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554All 554 codes →

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smtp;554 5.7.1 <email@example>: Relay access denied

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