Hi, thank you for the answer, and sorry for the late reply :( ...
I analysed the logs thoroughly, and I can confirm my SMTP server hasn't sent any email aside the legitimate ones.
And u/voracitude 's answer confirmed my thoughts, being that the emails were sent from somewhere else.
I don't think it's that much unusual to use a "small" domain for spoofing: SMEs are "easy targets" usually, and if the recipient's anti-spam isn't configured properly then the attackers could benefit from a domain which may be small but has a good reputation.
@intelisense
Hello, thank you for your answer and sorry for the late reply.
I took some time analyzing my SMTP server logs, and it contains 100% legit outgoing traffic. And no successful SSH connection for weeks on the server so it can't have been erased.
u/voracity confirms my thoughts as well. I think the issue is outside and unrelated to my server. And the e-mail address in question seems to have leaked from several places according to haveibeenpwned (the password is safe though).
@voracitude Thank you very much! This confirms my worries, not much can be done...
@wintermute_oregon
I tested on Mxtoolbox, it shows my server isn't an open relay.
@intelisense
Those are properly configured, I get a 10/10 on mail-tester dot com, as well as everything validated on mxtoolbox.
Domain facing massive e-mail spoofing attacks: Can something be done?
Hello,
I am running my own mailserver using Mailcow and I noticed, since mid-January, a huge rise of e-mail address spoofing attacks, in three ways: (1) a lot of spam ends up in the inbox despite having rspamd. (2) a few undelivered e-mail errors (3) some e-mails with rubbish content sent to public administrations, with my e-mail address mentioned in the "via" field, but different sender address (possibly from a third hacked mailserver), end up in my inbox as well.
My mailserver doesn't seem to have been hacked BTW, as e-mails were sent today and the last connection to the SMTP service was 2 days ago according to Mailcow admin UI.
Here are my questions: (1) Does the address spoofing make that rubbish mail end up in the recipients' inbox? (2) Is it shown as being sent by me or by the third hacked mailserver? (3) Is there a way to block the incoming spam using that technique in rspamd? (4) Can this spoofing attack impact my domain name's reputation (blacklist, ...?) (5) Last but not least, do you think I could get in legal trouble given the fact attackers seem to spoof my e-mail to target public administrations of my country (France, in case that matters)? If so, what could prove neither me nor my mailserver are faulty?
I am respecting all the good practices for e-mail security (SPF, DKIM, DMARC, and even signing my emails with an S/MIME cert). Oh and my server isn't an open relay _
Thank you!
@TheBaldness
What type of error is it? Time-out, blocked, ... ?
@TheBaldness
When opening the developer tools and going to the Network tab, are there errors? (refresh the page to be sure everything appears in the tab)
Un post de test vers un article depuis Iceshrimp
Voilà un test de post vers Lemmy depuis Iceshrimp
Lien vers un article pour voir : next.ink/122730/amd-annonce-ses-apu-ryzen-8000g-am5-avec-usb4-et-quatre-cpu-ryzen-5000-en-am4/ @testfediverse
@emma@beehaw.org If you are looking for a phone with an huge battery, CAT phones ("CAT" from "Caterpillar" - yeah, they make phones) can be interesting for you. You can choose one of them depending on how much you're ready to spend on it.
Otherwise, Fairphone 3 and 4 are good options as you can replace their battery when it dies, and they provide spare ones for as long as thhe device is supported (they support them usually much longer than most phones from other manufacturers, so far). I own a Fairphone 4 and it's very good. But maybe too expensive if it isn't your main internet/entertainment device.
@mnrockclimber@lemmy.sdf.org Oh, you're right! I didn't know about that. My bad 😄
@ajsadauskas@aus.social @technology@beehaw.org for photos, Flickr also fits: it is owned by Yahoo since 2005
@Magiwarriorx@lemmy.world i think it'd be very intensive in terms of disk and network usage. Not only for the r/place-like host, but also for other Fediverse server admins.
Clément VILLISEK [Old account] @ck.villisek.fr NEW ACCOUNT: @clemv My personal Fediverse instance will be shut down this summer, so please go to my new profile instead :)