Posted by pabs3 19 hours ago
It sometimes stops for weeks, then it continiues.
from my logs as an example: 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 <ki+bncBD77RLFFQACRBZOX3DEAMGQEU5V3LXY@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBD77RLFFQACRBZOX3DEAMGQEU5V3LXY@zf.thesparklebar.com> to=<rmayer13@nerd-residenz.de> 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 <ki+bncBD77RLFFQACRBZOX3DEAMGQEU5V3LXY@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBD77RLFFQACRBZOX3DEAMGQEU5V3LXY@zf.thesparklebar.com> to=<rmayer1000@nerd-residenz.de> 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 <ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com> to=<rmayer13@nerd-residenz.de> 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 <ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com> to=<rmayer333@nerd-residenz.de> 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 <hc+bncBDO2ZDH5DIIOXB6ZZADBUBB2QEZ74@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<hc+bncBDO2ZDH5DIIOXB6ZZADBUBB2QEZ74@zf.thesparklebar.com> to=<rmayer@nerd-residenz.de> 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 <ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com> to=<rmayerrmayer@nerd-residenz.de> 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 <ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com>: Sender address rejected: Domain not found; from=<ki+bncBDO2ZDH5DIIOXB6ZZADBUBFIYC6HQ@zf.thesparklebar.com> to=<rmayera@nerd-residenz.de> 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 shows others having the same problem.
I dont think this is limited to big tech.
I don't think people appreciate that this is really the key observation here. In large institutions, for anything significant to happen, there have to be incentives and alternatives, and these are set by management. Management in turn usually cares about their incentives, and the company overall mostly cares about the bottom line and the financial reports.
As a result, this is unlikely to get addressed, unless there is significant pressure, like media coverage, people mass-resigning from Gmail, or major email servers blocking Google. But none of these are likely to happen.
It isn't helpful.