Emaily – wedos blacklisted?

Dobrý den,

dnes se potýkáme s problémy při odesílání i přijímání e-mailů.

Odeslaný mail se nám vrátil:

host relay.zoner.com[217.198.120.23] said: 554 5.7.1 Service
    unavailable; Client host [46.28.106.15] blocked using ix.dnsbl.manitu.net;
    Your e-mail service was detected by spam.over.port25.me (NiX Spam) as
    spamming at Tue, 14 Jan 2020 09:48:00 +0100. Your admin should visit
    <a class="moz-txt-link-freetext" href="http://www.dnsbl.manitu.net/lookup.php?value=46.28.106.15">http://www.dnsbl.manitu.net/lookup.php?value=46.28.106.15</a> (in reply to RCPT
    TO command)

Na odkazované stránce je wedos blacklistnut:

http://zy0.de/q/46.28.106.15

Při doručování pošty nám dodavatel zaslal následující chybovou hlášku:

This is the mail system at host gelf26.thinline.cz.
 I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
 For further assistance, please send mail to postmaster.
 If you do so, please include this problem report. You can
delete your own text from the attached returned message.
                    The mail system
 <info@xxx.cz>: host wes1-mx1.wedos.net[46.28.106.11] said: 550 5.7.1
    <info@xxx.cz>: Recipient address rejected: sender blacklisted (in
    reply to RCPT TO command)

Můžete poradit?

Děkuji.

S pozdravem

KB