Mails refused back in error 550 5.7.1

[Samp]

Since we migrate on Zimbra we got sometime mails refused in error 550 5.7.1 as:

<c.traets@aflo.be>: host gw.aflo.be[87.66.26.108] said: 550 5.7.1 Your email
messages have been blocked by the recipient OR by Trend Micro Email
Reputation Service. Contact the recipient or his/her administrator using
alternate means to resolve the issue. (in reply to RCPT TO command)

These addresses had no problems before, have you an explication ?

Thanks in advance.

Sam.

[phoenix]

Originally Posted by Samp

Since we migrate on Zimbra we got sometime mails refused in error 550 5.7.1 as:

These addresses had no problems before, have you an explication ?

The error message really means what it says and you need to contact the recipient mail admin and find out why the message was rejected.

[Samp]

Originally Posted by phoenix

The error message really means what it says and you need to contact the recipient mail admin and find out why the message was rejected.

Yes and it's what I do, but I have this problem with several mails addresses, we have changed our IP MX address perhaps it is the origin of this problem...

Thanks for your help.

Sam.

[phoenix]

Originally Posted by Samp

Yes and it's what I do, but I have this problem with several mails addresses, we have changed our IP MX address perhaps it is the origin of this problem...

I have absolutely no idea what the problem is, only the admin of the receiving server can tell you why it was rejected.

[Samp]

Originally Posted by phoenix

I have absolutely no idea what the problem is, only the admin of the receiving server can tell you why it was rejected.

Thanks for your help and I know that's the problem don't come from our server but I would like to know why it's come since our IP and MX change.

Sam.

[phoenix]

Originally Posted by Samp

Thanks for your help and I know that's the problem don't come from our server but I would like to know why it's come since our IP and MX change.

Once you check with the receiving admin he'll be able to confirm the problem, it could be almost anything. You could start my checking if your domain or IP address is on any blacklists or if you have a reverse DNS for the IP etc., etc.

[uxbod]

Check your IP here :- MAPS - Support - Lookup Tool

[Samp]

Originally Posted by phoenix

Once you check with the receiving admin he'll be able to confirm the problem, it could be almost anything. You could start my checking if your domain or IP address is on any blacklists or if you have a reverse DNS for the IP etc., etc.

A check on DNSBL Information - Spam Database Lookup on our IP 88.191.228.233 are positive only on ips.backscatterer.org and dnsbl-2.uceprotect.net

I don't know why !?

Sam.

[Samp]

Originally Posted by uxbod

Check your IP here :- MAPS - Support - Lookup Tool

Yes we are on this DUL list !?

I have post a mail to the administrator of the list to ask why and to remove our IP.

Thanks for your help.

Sam.