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Port 25 on the ISP's firewall was closed. Now that I've opened it, it works. But shouldn't Plesk use port 587?

Testing with https://mxtoolbox.com/ The domain is reported blacklisted by UCEPROTECTL3. Which is the initial problem, from last week. And it also reports Failed To Connect SMTP

I was thinking exactly the same thing. For days, everyone has been telling me that the problem is on my server when maybe it's elsewhere.

I've already done this, several times today, but I don't see it in the log

There is no /var/log/mail.log. There is /var/log/maillog, mail.err and mail.processed. In maillog I mostly see an incredible amount of login attempts, but I don't see any blocked incoming mail errors. Mail is sent from an external mailbox, but does not arrive at any folder of the mailbox on...

You're right, I was inaccurate. Sorry. I meant, WHEN I fix the main problem, I still need to fix the unsunscribed list problem. In the initial post I had clarified the history of these problems. To fix the spam report, I now have ALL mail blocked incoming. I made the change you suggested to...

But this applies to all domains. This may work for plugins, but the configuration must be different for each domain. This would solve the List_Unsubscribe problem, but why am I not getting mail anymore?

Since I can no longer edit the post, I complete the information. Plesk is on a 1&1 VPS. I'm using Postfix and Roundcube Fixed the main problem, that of not receiving mail anymore, then I will also have to solve the problem with List-Unsubscribe. To do this I have to work on Roundcube, but where...

I haven't received any mail in any mailbox for a few days. It's not even in spam. The sender has no error report. Also, but I don't know if it's a related problem or different, all mail sent to a GMail mailbox ends up in spam; some other mailboxes on ISP also consider the mail as spam. In...

Yes, I've PasswordAuthentication no

On my ISP's firewall I closed port 22 and opened another port. I know they could still scan all open ports, but at least I'm making it a little harder for the lazy and the automatic. It is for this reason that I want to jail this port on Fail2Ban. Yes, PermitRootLogin = no. Then you still need...

Damn! It's not the wife, but an old tablet of mine that still had roundcube installed. Thank you very much. But in the log I see that there are still dozens of login attempts via ssh and postfix. I have my ISP's firewall already disallowing SSH access; so how do they try to log in? And how can...

In fact it's so. I was blocked again and from the logs I see that the access from the IP address is by Dovecot and Postfix. But I don't understand why; it is my home IP and accesses are continuous, even at night when the PC is off; furthermore I don't have smartphone applications that access...

Even if I had read into the future, Plesk blocked me both from the PC and from the smartphone. I solved by typing the two commands in the console, but now I would like to understand why it blocks me every day from the dynamic IP. The Internet line at home is always the same and it's normal for...

Plesk is on a VPS with static V4 public IP. The office has an Internet line with dynamic IP V4 and static IP v6. I would like to block access to Plesk using a static IP; can I use the IP V6 one? If for some reason I can't access from that address, can I change it via SSH or from the VPS...

If I access the server without specifying the port, Plesk's Web Server's Default Page appears, inviting me to login. Can I change this home page? I don't want any reference to Plesk to appear, much less the invitation to log in.

I found myself blocked by Fail2ban with all dynamic addresses used. And you don't always have the availability of a state IP to associate.

I found your answer to a problem I was having as well. I can also enable the static IP address of my office, but then when I'm around for work how do I access the server? I can't always use a static IP to associate and sometimes I have to use the dynamic one, for example that of the hotspot...

Thanks, I fixed it with iSP.

Today I find out that Plesk is not reachable either using the IP address or the associated domain. Even the portals installed on the server are not reachable, as well as the Webmail. Pinging the server address works fine. Obviously the server (VPS) was restarted several times. From the KVM...