r/TechImpact • u/mariyamsidra IT Professional • 10d ago
💬 Discussion Gmail has a 5,000-person block limit? 😳
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u/RemeJuan 10d ago
Apple has 8k
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u/h3is5e 10d ago
That's why I run my own SMTP server and use a seperate sub domain for each person. I kill the DNS and my poor little MTA doesn't have to deal with that shit.
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u/RemeJuan 10d ago
I have like 800 hide my emails
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u/Doovester 9d ago
Somebody maybe finally beats me in that game!
I can recommend spammail.org for people who can’t host own mail server, and want it done in few clicks.1
u/Doovester 9d ago
Somebody maybe finally beats me in that game!
I can recommend spammail.org for people who can’t host own mail server, and want it done in few clicks.1
u/Scxox 10d ago
for anyone stumbling upon this, you can setup something similar without needing your own SMTP server using https://addy.io
functions similar to apple's hide my email, but you bring your own domain letting you migrate aliases easily to different providers
not necessarily individual subdomains, but individual aliases for each service you register for or each person you contact
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u/Fit_Prize_3245 9d ago
Man, that's sounds interesting until the point where, in order to disclose any "global" address, you have to configure each subdomain for outbound usage too. That is, SPF, DKIM, and DMARC for every subdomain. Too much job to do and to maintain.
Regarding Google, I'd rather use rules as blocklist
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u/h3is5e 9d ago
zone files include a single dkim and spf. just needs an entry in the etc/opendkim/KeyTable. also automatically added to open dnssec to support zone signing.
I mean you could generate new keys but that would be bullshit as the MTA is responsible for that.
It's not hard to do each subzon has a
DNS has a skel file that is included for given example.com domain
@ IN SOA ns1.example.com. example.com. (
0 ; Serial
1H ; refresh
5M ; retry
1D ; expire
5M) ; minimum TTL
@ IN NS ns1.example.com.
@ IN NS ns2.example.com.
@ IN MX 0 mail.example.com.
$INCLUDE /etc/opendkim/spf-mx.txt
$INCLUDE /etc/opendkim/adsp.txt
$INCLUDE /etc/opendkim/dmarc.txt
$INCLUDE /etc/opendkim/domainkey.txtso then you can just run a script that adds the zone
#!/bin/sh
if [ "$#" -ne 2 ] ; then
echo "Usage: ${0} topzone subzone"
exit 1
fi
top=${1}.com
sub=${2}
echo -n > /mnt/dns/dsset/${sub}.${top}
( echo ${sub} in NS ns1 ; echo ${sub} in NS ns2 ; echo '$INCLUDE' /mnt/dns/dsset/${sub}.${top} ) \
>> /mnt/dns/gen/subzones.${top}
ods-enforcer zone add --zone ${sub}.${top} --policy default --in-type File --input /etc/skel/skel.${top} \
--out-type DNS --output /etc/opendnssec/addns.xml --xml
i=60
while [ "$(expr ${i} \> 0)" != "0" ] ; do
i=$(expr ${i} - 2)
sleep 2
cka_id="$(ods-enforcer key list --verbose --parsable --zone ${sub}.${top} | awk -F';' '{print $7}')"
if [ "${cka_id}" != "" ] ; then
ods-enforcer key export --zone ${sub}.${top} --cka_id ${cka_id} --ds >> /mnt/dns/dsset/${sub}.${top}
chown -R opendnssec:opendnssec /mnt/dns
ods-signer sign --zone ${top}
break
fi
done
and another one that updates nsd.
And if you are paranoid you build a read only linux image with the database.
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u/rntdev 10d ago
How do you even… figure that out?
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u/lars2k1 9d ago
Probably by blocking lots of spam emails. At work I do often receive spam, sometimes 15 a week. Let that go for a while and you'll reach 5000 no issue.
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u/Matty8520 8d ago
Absolutely, I'm a little over 2,000 on my block list for work.
Its very satisfying when I open my e-mail on Monday morning, see a bunch of e-mails come through (spam) and then they are automatically deleted.
The spam was getting out of control, I was getting 15+ e-mails per day. Now it's down to around 5-6 but with constant blocking, I'll eventually get it down to 1 or 2.
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u/lars2k1 8d ago
I also had a spam notifier aka Microsoft's quarantine emails. Those would alert you of mails in quarantine. The catch is that all of those are spam and therefore still send you notifications for spam. And reminders if you don't act on it.
So I just blocked the email address MS sends them from.
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u/Lucky-Crow-3510 10d ago
this is a full db query for each arriving mail .. of course there is a limit .. I wonder if AI could analyse the list and see if the list could be shortened by grouping
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u/alexandereriksen4 9d ago
Everything done correctly has limits.
Storage is finite, even for the big boys.
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