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You can use or another way or for https

Hello, is there a way to see all the current connection to the webserver?

The default have changed,
Add these lines to your config, to tell to use /etc/hosts and not DNS

Simplest way edit the site conf file in
nano /etc/apache2/sites-available/000-example.com.conf

and add or update:
<VirtualHost *:443>
ServerName www.example.com
redirect permanent / http://www.example.com/
</VirtualHost>

This will redirect and https://www.example.com to http://www.example.com ...

Options DMARC record

;; [v=DMARC1] ⇒ DMARC version

;; [p=***] : action policy when authentication fails
;; - [none] ⇒ do nothing
;; - [quarantine] ⇒ quarantined in junk mail folder
;; - [reject] ⇒ reject email

;; [rua=mailto:***] : the address to which aggregate reports will be sent
;; * if not ...

basic description of SPF.

the TXT record itself can have multiple lines,
;; but in SPF settings, only one TXT record can be set for one domain name

;; [v=spf1] ⇒ it means SPF version

;; [+ip4] ⇒ specify IPv4 addresses
;; [+ip6] ⇒ specify IPv6 addresses

;; [+] ⇒ verify your domain's mail server ...

how to setup SPF and DMARC in bind/named

Configure a DMARC (Domain-based Message Authentication, Reporting, and Conformance) record to indicate that your mail server is protected by SPF (Sender Policy Framework)
These are attempts to counter spam, so it is best to set it for you domain.

in the ...

The newer version of thunderbird are more strict on certificates, specially on self-signed certificates.
If you have a private imap-server that you maintain yourself you probably use this.

You can find a tutorial on this site:
https://softwareprocess.es/homepage/posts/dovecot-thunderbird-ssl-alert ...

Sounds like the client is not accepting the certificate.
did you change the certificate of the server recently ?

I think you need to accept the new certificate on the client software.
In K-9 it is in Settings > accounts > Fetching mail > Incoming Server > Next of Advanced
and accept the new ...

The problem is comparing different encode character-sets.

You can see the character-sets with:
SHOW VARIABLES LIKE 'char%';
SHOW CREATE TABLE table_name;

FYI: utf8mb4 is NOT a character encoding, utf8mb4 is just MySQL's nickname for utf8. what MySQL calls utf8 is actually a 3-byte subset of the ...