Can anyone help me out with this??

That means Yahoo has disconnected your session. Possible causes:

You been idle too long (not likely)
Yahoo thinks you're a spammer
Yahoo thinks you have a virus that's sending out these emails

Also, if you don't have business class internet your ISP may be watching your traffic to make sure you're not a spammer, infected with virus, etc.

Is there any solution for me to avoid being blockeD?
cuz it does look like i'm spamming but then again, i'm just broadcasting the ads.

Will sending the email in smaller amount each time solve the problem?

thanks,

Why are you sending out ads to such a large amount of people that yahoo thinks you're a spammer?

You can send out bulk emails, but you need to contact the ISP/mail host and explain to them that you are sending this to people who have ASKED for your email.

Plus, I'm betting your subject and body are pretty fish...

there should be an error number associated with that error, if
it's a 500 error it's most likely a relay access block issue. (550
relay denied, etc). In this case your going to want to check the
blacklists at www.spamhaus.org.

What it really looks like is a poor connectivity problem, your mail
server could be trying to send too much information at once, or
you may have an issue with connectivity or latency. Whats kind
of link is this server connected to, and how is dns set up? Is
there reverse dns set up? Sometimes if there is no PTR record
other mail servers will immediately assume you are a spammer
and drop (while I havent seen it with yahoo it is possible)

check this by running nslookup in a command prompt and then
issuing the following:
set querytype=PTR
then type in the mail domain (just domain name, no hostname
or mail.)
mydomain.com
if it returns an answer you've got PTR records, if not you may
want to contact your ISP about gettng those put into place.

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