Mail not received

What type of hardware are you using: VPS bought online
What YunoHost version are you running: YunoHost 12.0.4.1 (testing)
How are you able to access your server: The webadmin & SSH

Describe your issue

I am able to send E-Mails to something like GMail, but I am not able to receive E-Mails.
For example, sending “Hello” to my GMail works just fine, but replying in GMail results in no errors, I just never get the reply.
Doesn’t seem to matter what E-Mail client I use either, as both Snappy and Roundcube only show internal mails, never anything from something like GMail.

There’s also nothing in any other folder, like Spam.

I also never get any error or anything on any side.
GMail says the mail was sent successfully, another E-Mail account I have that I have in Thunderbird says it’s sent etc.
And journalctl -u dovecot.service -f doesn’t show any errors, just that I login and then logout.

The main domain has E-Mail activated:

Outgoing emails: Yes
Incoming emails: Yes

Diagnostics report no errors:

Email
Everything okay!
Last time ran: less than a minute ago

The SMTP mail server is able to send emails (outgoing port 25 is not blocked).

The SMTP mail server is reachable from the outside and therefore is able to receive emails!

Your reverse DNS is correctly configured!

The IPs and domains used by this server do not appear to be blacklisted

0 pending emails in the mail queues

Despite all of this, I’ve not received a single external message in my Yunohost E-Mail.

What’s going on?

Share relevant logs or error messages

No errors.
No nothing.

Some additional information regarding this.
After about 24 hours, I received a message from Mail Delivery Subsystem <mailer-daemon@googlemail.com>

The mail says:

Delivery incomplete

There was a temporary problem while delivering your message to vemod@skumrask.se. Gmail will retry for 45 more hours. You’ll be notified if the delivery fails permanently.

LEARN MORE
This link will take you to a third-party site

The link points to: https://check.spamhaus.org/returnc/pub

At the bottom it also says:

554 5.7.1 Service unavailable; Client host [<redacted>] blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/pub/

I’ve no idea really what this means.

Vérifie les logs dans la webadmin > tools > services > rspamd

I do not have any such service:
image

I did however see this in /var/log/mail.log:

2024-10-09T16:48:56.233400+00:00 <redacted> postfix/smtpd[646427]: Anonymous TLS connection established from mail-lj1-x232.google.com[2a00:1450:4864:20::232] to <redacted>: TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (3072 bits) server-digest SHA256
2024-10-09T16:48:56.336225+00:00 <redacted> postfix/smtpd[646427]: NOQUEUE: reject: RCPT from mail-lj1-x232.google.com[2a00:1450:4864:20::232]: 554 5.7.1 Service unavailable; Client host [2a00:1450:4864:20::232] blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/pub/162.158.180.177/; from=<<redacted>> to=<<redacted>> proto=ESMTP helo=<mail-lj1-x232.google.com>
2024-10-09T16:48:56.355374+00:00 <redacted> postfix/smtpd[646427]: disconnect from mail-lj1-x232.google.com[2a00:1450:4864:20::232] ehlo=2 starttls=1 mail=1 rcpt=0/1 bdat=0/1 quit=1 commands=5/7

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