Emails cannot be delivered ("550 relay not permitted")

Can you be more specifc? is this internal sending, or email from outside?
Can you: Telnet SERVER 25?
From the server that said can't connect?
All services running? maybe anti-virus is causing a problem?
Also, do you have Broadcom NICs?

check your smtp virtual server settings
is it configured to use a smart host or dns

I hate the 550 error. Something has changed and it can be with the ISP or you. Notice that you say a lot of emails could not be delivered. Does that mean that some of them are going even now?

Ken

The send fail on outside recipients...

Not all of them have problem... Some of them deliver OK...

Both of them receive emails with no problem...

All services are OK...

What do you mean by Broadcom NICs?

The settings in the mail servers must be OK because they were working OK for months...

I beleive the problem must be in the specific mail servers which do not accept my server for receiving email...

Maybe I am in blacklist which those specific mail servers take in mind...

I already check for blacklists (http://www.mxtoolbox.com & http://www.dnsstuff.com) but only UCEPROTECTL2, UCEPROTECTL3 lists affect me....

the error states "relay not permitted" so it would appear that either the SMTP server is setup incorrectly or the smarthost you are trying to use is not setup to allow you to send email through it.

Take a closer look at the NDR and see if you can figure out where it came from - if it comes from the ISP mail gateway, then give them a call. Or post the NDR + headers in here and someone may be able to help

The failed domain is secutex.de... the ip is 80.237.138.5...

I try the telnet from the mail server and there was no problem sending it....

Very strange...

Here it is the NDR...

_____________________________________________
From: ¿¿a¿e¿¿¿st¿¿ s¿st¿µat¿¿
Sent: Wednesday, September 15, 2010 3:38 PM
To: Gortsilas Andreas
Subject: ¿e¿ pa¿ad¿¿¿¿e: FW: REMINDER FW: SECUTEX 10 09 10 OFFER REQUEST S¿¿¿¿¿ FW: ¿¿¿¿GG¿¿¿¿ SECUTEX K2374-0032-0074
Importance: High


¿¿ µ¿¿¿µ¿ sa¿ de¿ ¿ftase se µe¿¿¿¿¿¿ ¿ se ¿¿¿¿¿ t¿¿¿ pa¿a¿¿pte¿ st¿¿¿ ¿p¿¿¿¿¿ ape¿¿¿¿¿ta¿.

      T¿µa:      FW: REMINDER FW: SECUTEX 10 09 10 OFFER REQUEST   S¿¿¿¿¿ FW: ¿¿¿¿GG¿¿¿¿ SECUTEX K2374-0032-0074
      ¿p¿st¿¿¿:      15/9/2010 3:38 µµ

¿e¿ ¿ta¿ d¿¿at¿ ¿ ep¿¿¿¿¿¿¿¿a µe t¿¿¿ pa¿a¿¿t¿ pa¿a¿¿pte¿:

      'i.leinders@secutex.de' st¿¿ 15/9/2010 3:38 µµ
            ¿¿¿¿¿¿¿e ¿¿a p¿¿ß¿¿µa ep¿¿¿¿¿¿¿¿a¿ SMTP µe t¿ d¿a¿¿µ¿st¿ ¿¿e¿t¿¿¿¿¿¿¿ ta¿¿d¿¿µe¿¿¿ t¿¿ pa¿a¿¿pt¿.  ¿p¿¿¿¿¿¿¿¿ste µe t¿ d¿a¿e¿¿¿st¿ t¿¿ s¿st¿µat¿¿ sa¿.
            <mailgate2.sabo.gr #5.5.0 smtp;550 relay not permitted>

sorry for the greek chars...

No I do not use a smarthost...

Is that someone you do business with? And send to regularly?
Maybe they have blacklisted you locally with a custom rule. Maybe by accident, say for instance they are doing country blocking.

We have problem with many different hosts... not just one...

In the properties of the SMTP virtual server I do not see anything strange...

I do not use smarthost...

Can you be more specific?

what adress are you trying to send to just the @domain.com part - dont need the username?
The response "relay not permitted" seems to come from mailgate2.sabo.gr - I wonder if this is the gateway of the domain you are trying to send to or something else ?

For example @secutex.de...
mailgate2.sabo.gr is the fully-qualified domain name in the settings of the virtual smtp server of the mail server...

if you send me your email (in agorts@sabo.gr) I will reply you back the settings of the virtual smtp server to take a look at them...

So it would seem that your mail server is unable to relay correctly - I sent you an email - I will have a look if you want to send some screen shots :)

did you get my email (agorts@gmail.com)?

so if my problem is in the virtual smtp server can you help me identify it?