Barracuda

Barracuda is a spam filter, block list, and firewall promoted for businesses, headquartered in California. Mail is routed through mailservers owned by Barracuda before it's passed along to the recipient domain's mailservers for final delivery. The recipient is able to manage a lot of delivery settings such as allow lists, but sender reputation issues that affect all Barracuda customers globally may require contacting Barracuda support directly to resolve.

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421All 421 codes →

smtp;421 Temporary failure, please try again later.

Low severity

smtp;422 License Expired

Low severity

422All 422 codes →

smtp;422 License Expired

450All 450 codes →

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

Medium severity

451All 451 codes →

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

smtp;451 4.7.1 Try again later

smtp;451 cuda_nsu 4.4.3 Temporary server error. Please try again later

550All 550 codes →

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

Low severity

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

Low severity

smtp;550 Blocked

smtp;550 rejecting spoofed message

High severity

smtp;550 permanent failure for one or more recipients (email@example.com:blocked)

554All 554 codes →

smtp;554 rejected due to spam URL in content

High severity

smtp;554 rejecting banned content

High severity

Other spam filter services

Built with

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