Hi,

On 10 Dec 2025, at 14:41, Ralf Hildebrandt via Postfix-users wrote:

> Yes, the machine shouldn't have accepted [email protected]
> in the first place, but... shouldn't bouncing the mail work anyway?
>
> These mails are all spam anyway, but I wonder WHY postfix would report 
> "bounce failed".
> Should I add "-v" to the "bounce" entry in master.cf?
>
> There's no "(error|warning|fatal)" log entries in that period.
> This is Postfix 3.5.25

I see the same here.

These mails would bounce back to Google, and Google mail is not accepting the 
bounces with

"550-5.2.1 The user you are trying to contact is receiving mail at a rate that 
prevents additional messages from being delivered. ..."

Example:
Dec 10 11:41:00 mx01 postfix/smtp[2970373]: 4dRC1R63pSz2xqb: 
<[email protected]> 
aspmx.l.google.com[173.194.76.27]:25, delay=0.21, delays=0.06/0/0.13/0.02, 
dsn=5.2.1, bounced (host aspmx.l.google.com[173.194.76.27] said: 550-5.2.1 The 
user you are trying to contact is receiving mail at a rate that 550-5.2.1 
prevents additional messages from being delivered. For more 550-5.2.1 
information, go to 550 5.2.1 
https://support.google.com/mail/?p=ReceivingRatePerm 
ffacd0b85a97d-42fa6c137eesi204755f8f.139 - gsmtp (in reply to RCPT TO command))

It's also all spam as well.

Greetings

Carsten

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