Yahoo rejecting mails, log full with login attempts of random

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#1 Tue, 03/31/2015 - 09:01

Yahoo rejecting mails, log full with login attempts of random


I use postfix mailserver but mails to addresses are not sent. The mails are rejected with this message: (XX is my IP adress)

" host[] said: 421 4.7.1 [TS03] All messages from XX.XX.XX.XX will be permanently deferred; Retrying will NOT succeed. See (in reply to MAIL FROM command) "

How to solve this error?

I checked my log for strange mailbehaviour and there are many SMTP and pop3 login attempts from all kind of fake users like,,, etc.

Anyone an idea about what is going on and how to solve this?

Searching for the error already gave me a few suggestions, like that I have an open relay, so I edited my postfix, to cntain a few lines with restrictions like suggested on this forum: , but still the same problem.

Was this indeed my problem and do I need to give it more time, or should I fix something else?

Thanks a lot like always!

Tue, 03/31/2015 - 09:49


The website Yahoo links to regarding that issue is this one:

That suggests that Yahoo thinks your server is sending spam, and is rejecting messages from your server.

You may want to go to a site such as this one, and see if your IP address shows up in any RBL lists:

Also, what is the output of this command:

mailq | tail -1

Sat, 04/04/2015 - 03:35

Many thanks!

It indeed seems to be a blacklisting problem, I suggested a recheck at yahoo so I will wait this out for now.

Another questions, for a new domain, another VPS, I receive this error message:


Delivery to the following recipient failed permanently:

Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain by [IP.AD.DR.ES].

The error that the other server returned was: 554 5.7.1 <[]>: Client host rejected: Access denied


Any ideas on this?


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