Hi,
im having mail server. im using sendmail.but it is not able to send to certain domain names....mails are getting back with the following errors
..........
this is from logs

Sep 20 10:10:35 mail sendmail[32378]: o8K73O3l032373: o8K73V3l032378: DSN: Service unavailable
Sep 20 10:12:07 mail sendmail[32431]: o8K74x3h032427: to=<Karthikeyan.Krishnan@****.com>, ctladdr=<suboor@***.com> (659/100), delay=00:00:03, xdelay=00:00:02, mailer=esmtp, pri=120709, relay=mail.messaging.microsoft.com. [94.245.120.86], dsn=5.0.0, stat=Service unavailable
this is from mail
----- Transcript of session follows -----
... while talking to mail.messaging.microsoft.com.:
>>> >>> HELO *****.com.
<<< 501 5.5.4 Invalid domain name
554 5.0.0 Service unavailable
here *** is for domain name........
im fedup with this error any one could plz helpme why this is happening...........

I'm assuming the receiving domain exists and isn't blacklisted by your relay server.

It looks like you're seeing the problem described here. MS Exchange does not permit trailing '.' (period) or ' ' (space) characters after the host name. Are you able to send directly to determine whether it is an issue with mail.messaging.microsoft.com?

tnx for ur reply.
when my clients are sending mails to some domains mails are getting backed with the fatal errors....
helo domanname.com.
501 5.5.4 invalid domain name...
why my mails are getting backed???i have checked my sendmail.mc it looks fine.where is the problem.did anyone face this prblm before.if yes plz provide me the link.thre is no issue to mail.messaging.microsoft.com

HI every one my client mails are still getting back.so i found out that my ip address is on blacklist on below 2 address.
dnsbl2-.uceprotect.net,dnsbl3-.uceprotect.net.
so i want to know is this the reason due to which my mails are getting back.plz help me on this.
iam waiting for ur response.
thanking You

http://www.spamhaus.org/lookup.lasso

also see wats the relay limit of you live ip...

tnx for ur reply sir,
no its listed there.i have checked it.will they used centralized db so that if one spammer blocked my ip address then will all will spam me aswell????? my clients are getting restless here plz helpme to resolve the issue.

my mails are getting back with this error plz check this and telme the solution.i suspect my ip is in blacklisted list.plz help me on this.


**********************************************
** THIS IS A WARNING MESSAGE ONLY **
** YOU DO NOT NEED TO RESEND YOUR MESSAGE **
**********************************************

The original message was received at Sun, 26 Sep 2010 10:53:49 +0307
from [10.21.1.92]

----- Transcript of session follows -----
<sureshkumar.gnanaguru@aramco.com>... Deferred: Connection timed out with vectra.aramco.com.
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

Hi,

Refer these links;these will help you a lot

Also see for windows system which are being affected by viruses which may be sending mails/spams from you mail server:

http://www.howtoforge.com/how_to_avo...ng_blacklisted

http://www.blacklistedip.com/faq.php

http://www.supportsages.com/blog/201...ed-a-few-tips/

tnx very much for ur reply.
i know my mail server is in one of blacklist spam server...so what i want to know is that is the reason my mails are not going to some domains or some other reason.i have resolved the dns issue with ISP provider.sendmail server is able to send to certain domains.plz provide me information .iam waiting for ur reply...

Hi,

Take a look at www.mxtoolbox.com. There are a number of reasons why you might be getting blacklisted. Some of which you will have little or no direct control over.

If you run the blacklist search for your server on the above site, you will be able to find out what lists you are on and why.

Different domains will use different rules for allowing or blocking mail. Some will even block IP ranges based on the volume of spam. In other words, if your service provider/hosting company has infected sites, this can affect your own servers rating.

Sir,
i thank you for ur response.i know from that link only my IP is blacklisted in 3 servers.now whn my clients are sending mails there mails are getting back with this error.
The original message was received at Mon, 27 Sep 2010 09:22:25 +0307
from localhost

----- The following addresses had permanent fatal errors -----
<gshibli@jeraisy.com>
(reason: 501 5.5.4 Invalid Address)

----- Transcript of session follows -----
... while talking to mail.jeraisy.com.:
>>> HELO domainname.com.
<<< 501 5.5.4 Invalid Address
554 5.0.0 Service unavailable

i want to know that due blacklisted only my client mails are getting back or for some other reason.????this is happening from the last 10 days plz helpme to overcome from this problm.

Hi,

You might not have configured the domain name in sendmail correctly. It looks like the remote servers are not resolving you domain.

I'm not 100% sure how to set this in sendmail as I use Postfix.

Also, if you have a dedicated IP address, have your ISP add a reverse DNS entry for the IP pointing back to your domain.

Finally, it can take up to 48 hours to have your server removed from a blacklist. I'd concentrate on following the instructions on MXToolBox and getting that sorted ASAP

Mark

hi i have checked in sendmail.mx i have a correct domain name with reverse dns pointing to domain name.i have sorted out that issue but when im reading on mxtoolbox they are just saying that ask ur ISP people to remove uraddress from list.i cantdo anythng on that.i have mailed the isp people regarding that.anywayz i have checked somethng on mxtoolbox here is the output plz check this and telme wht does it mean
220 google.com(domain name). ESMTP Sendmail 8.14.1/8.14.1; Mon, 27 Sep 2010 15:08:03 +0308


Not an open relay.
0 seconds - Good on Connection time
9.812 seconds - Not good! on Transaction time
OK - 62.149.85.46 resolves to hostname(demo.mail.com)example
OK - Reverse DNS matches SMTP Banner

Session Transcript:
HELO please-read-policy.mxtoolbox.com
250 domainname(google.com). Hello recover.mxtoolbox.com [64.20.227.133] (may be forged), pleased to meet you [1264 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 2.1.0 <supertool@mxtoolbox.com>... Sender ok [1279 ms]
RCPT TO: <test@example.com>
550 5.7.1 <test@example.com>... Relaying denied. IP name possibly forged [64.20.227.133] [998 ms]
QUIT
221 2.0.0 domainname like(google.com.) closing connection [858 ms]
plz helpme on this

It says you're not allowed to relay the mail. Relaying is sending mail to a different different domain than the one you're connected to. In your case it looks like you're connected to google.com and trying to send mail to example.com. In this case you should be sending mail to a user @google.com

hi sir,
actually i edited this bcz at the place of google.com my domain name was there so security reasons i changed it to google.so could u plz telme my client mails are getting back from certain domains.so wht should i do inorder to send those mails.wht the above lines suggesting.
iam waiting for ur reply sir.thanks in advance