SMTP Code 450

The mail server encountered a temporary failure. If the command is repeated without any change, it might be completed. Mail servers can use temporary failures like this to keep untrusted senders at bay.

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Email service providers

GmailAll Gmail codes →

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smtp;450 4.2.1 The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. Please resend your message at a later time. If the user is able to receive mail at that time, your message will be delivered. For more information, please visit https://support.google.com/mail/?p=ReceivingRate - gsmtp

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HotmailAll Hotmail codes →

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smtp;450 4.7.3 Organization queue quota exceeded. [outlook.com]

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VerizonAll Verizon codes →

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smtp;450 User is receiving mail too quickly

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YandexAll Yandex codes →

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smtp;450 4.2.1 The recipient has exceeded message rate limit. Try again later.

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Spam filters services

BarracudaAll Barracuda 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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SymantecAll Symantec codes →

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smtp;450 Requested action aborted [9] 266-23, please visit http://www.symanteccloud.com/troubleshooting for more details about this error message.

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ZeroSpamAll ZeroSpam codes →

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smtp;450 4.2.0 <email@example.com>: Recipient address rejected: example.com greylisted for 60 seconds by ZEROSPAM

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Other SMTP codes