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554 5.7.1 You are not allowed to connect. sending from postfix [Resolved]

I know a similar questions have been posted in different forums, but after following the recommendations I'm still stuck with this error, the problems is as follows:

I've an email server at where all the notifications are sent to users, this has been working flawless for some months now, recently I started to notice the following messages in the logs:

Mar 28 06:37:39 djondbserver postfix/smtp[19355]: 406B85C00B5: to=,[]:25, delay=411817, delays=411817/0.09/0.73/0, dsn=4.7.1, status=deferred (host[] refused to talk to me: 554 5.7.1 You are not allowed to connect.)

(sorry I'd to change the user's email to avoid spams)

So I checked and the forums/stackoverflow/etc pointed that it may be a problem of (this is the name of the email server) been black listed somewhere (public spam lists or directly at, so I proceed to check all the different spam servers using mxtool, with no luck, taskgeo is not reported anywhere, also I've sent an email to the admin of and they said that taskgeo is not in their blacklist either, and they added it to the whitelist just in case, but still the error is there, so I found out that it might be related with the PTR records not been added correctly, so I proceed to fix this and now it's pointing correctly, but I'm still getting the error, I even tried to open telnet 25 directly from the server and the answer is this:

Connected to
Escape character is '^]'.
554 5.7.1 You are not allowed to connect.
Connection closed by foreign host.

so I'm lost, Even the code error does not match to the forums I read, as 554 is usually related with other descriptions rather than "You are not allowed to connect".

Can you point me in the right direction? am I right to think that has been added to a blacklist inside bizagi server, or is a misconfiguration of postfix?

Additional information: emails are working fine to a wide variety of other servers, gmail, amongst them.

Thanks once more for any information.

Question Credit: Cross
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Asked April 12, 2019
Posted Under: Network
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