From multiple corporate mail servers, ours collaborators, we don't get emails.
These servers are hosted by private emails companies.
We receiving mails from Gmail, and from other emails servers.
The mutual thing for these mail servers from which we don't receive mail are: No TLS support.
Those emails are very important to us, accountant, supplier.
X.X.X.X - collaborator IP
Y.Y.Y.Y - out IP
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Jul 29 06:29:57 zimbra postfix/postscreen[27305]: CONNECT from [X.X.X.X]:36450 to [Y.Y.Y.Y]:25
Jul 29 06:29:57 zimbra postfix/postscreen[27305]: PASS OLD [X.X.X.X]:36450
Jul 29 06:29:57 zimbra postfix/smtpd[27306]: connect from mx1.mail.collaboratorX.rs[X.X.X.X]
Jul 29 06:29:57 zimbra postfix/smtpd[27306]: Anonymous TLS connection established from mx1.mail.collaboratorX.rs[X.X.X.X]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256
Jul 29 06:29:57 zimbra postfix/smtpd[27306]: NOQUEUE: filter: RCPT from mx1.mail.collaboratorX.rs[X.X.X.X]: <info@mail.collaboratorX.rs>: Sender address triggers FILTER smtp-amavis:[127.0.0.1]:10026; from=<info@mail.collaboratorX.rs> to=<y@our.mail.rs> proto=ESMTP helo=<relay05.comtradecloud.com>
Jul 29 06:29:57 zimbra postfix/smtpd[27306]: warning: permit_tls_clientcerts is requested, but "smtpd_tls_ask_ccert = no"
Jul 29 06:29:57 zimbra postfix/smtpd[27306]: NOQUEUE: filter: RCPT from mx1.mail.collaboratorX.rs[X.X.X.X]: <info@mail.collaboratorX.rs>: Sender address triggers FILTER smtp-amavis:[127.0.0.1]:10024; from=<info@mail.collaboratorX.rs> to=<y@our.mail.rs> proto=ESMTP helo=<relay05.comtradecloud.com>
Jul 29 06:29:58 zimbra postfix/smtpd[27306]: NOQUEUE: reject: RCPT from mx1.mail.collaboratorX.rs[X.X.X.X]: 554 5.7.1 Service unavailable; Client host [X.X.X.X] blocked using xbl.spamhaus.org; from=<info@mail.collaboratorX.rs> to=<y@our.mail.rs> proto=ESMTP helo=<relay05.comtradecloud.com>
Jul 29 06:29:58 zimbra postfix/smtpd[27306]: disconnect from mx1.mail.collaboratorX.rs[X.X.X.X] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8
Second collaborator send mail with gmail to us, an error which he got when he try to sent email to us with his main mail.
Y.Y.Y.Y - out IP
Z.Z.Z.Z - collaborator 2 IP
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This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
user1@our.mail.rs
SMTP error from remote mail server after RCPT
TO:<user1@our.mail.rs>:
host our.mail.rs [Y.Y.Y.Y]: 554 5.7.1 Service unavailable;
Client host [Z.Z.Z.Z] blocked using sbl.spamhaus.org; Error:
open resolver;
https://www.spamhaus.org/returnc/pub/2400:cb00:124:1024::ac44:dc86
------ This is a copy of the message, including all the headers. ------
Plese could you help me with this.
Has this happened to you in the past 15 days?
Can i add an exception for them or do something?
Thank you very much
Best regards