Re: [mailop] Google trying to send mail to nonexistent users - going for about a month

Chris via mailop Thu, 13 Nov 2025 15:44:47 -0800

On 2025-11-13 13:28, Ralph Mayer via mailop wrote:

Dear mailops,


I need some ideas how to deal with this (small snippet from my logs)

Nov 13 22:10:51 bert postfix/smtpd[2693931]: NOQUEUE: reject: RCPT from
mail-oi1-x248.google.com[2607:f8b0:4864:20::248]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-oi1-x248.google.com>
Nov 13 22:12:07 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-ua1-x948.google.com[2607:f8b0:4864:20::948]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-ua1-x948.google.com>
Nov 13 22:12:18 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-wm1-x346.google.com[2a00:1450:4864:20::346]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-wm1-x346.google.com>
Nov 13 22:12:37 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-lf1-x146.google.com[2a00:1450:4864:20::146]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-lf1-x146.google.com>
Nov 13 22:13:08 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-lj1-x248.google.com[2a00:1450:4864:20::248]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-lj1-x248.google.com>
Nov 13 22:13:08 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-wm1-x345.google.com[2a00:1450:4864:20::345]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>

to=<[email protected]> proto=ESMTP helo=<mail-wm1-x345.google.com>

Nov 13 22:14:03 bert postfix/smtpd[2696594]: NOQUEUE: reject: RCPT from
mail-lj1-x248.google.com[2a00:1450:4864:20::248]: 450 4.1.8
<[email protected]>: Sender address
rejected: Domain not found;
from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<mail-lj1-x248.google.com>

As you can see, the to-address is generated and its different hosts at google

trying to send mails.

Searching for zf.thesparklebar.com <http://zf.thesparklebar.com/> shows others

having the same problem.

[email protected] <mailto:[email protected]> did not respond

Also, why does this not trigger countermeasures at Google?

This smells like transient DNS failures. IOW no IP address could be found for host(name).



Best regards
Ralph
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Re: [mailop] Google trying to send mail to nonexistent users - going for about a month

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