Is my mail server blacklisted?
110106
Your mail matches conditions set up in a filter, whether it's your account, domain, content, etc., and the receiver is bouncing it. \n\n"CAUSE:\n\nThe receiver has set-up filters on their email account. Your (the senders) email matches specific conditions set by these filters and therefore the message has been rejected based on the receivers preferences."
85218
Get a different mail server
938807
you might have to go into our firewall and make hotmail a trusted site. i had the same problem with another site.\n\nHope this helps...
704455
Delete any email  not recognised by you.It may be a spam....! The spam may be due to many reasons…! Many hours are wasted due to spam email. However, by taking simple precautions while giving out your email and installing updated free software, you can prevent spam. More info available at\n http://fixit.in/stopspam.html
784549
Is the incoming mail server being set to 127.0.0.1? If so, it is probably your anti-virus program doing it. Its setting your email to go though the virus scanner, but it isn't working properly. See if you can disable email scanning in your anti-virus and see if that fixes the problem. If it does you may need to update the anti-virus or you may want to change anti-virus programs.
105684
It very well be because you are behind a firewall or the recipient is. Or the mail you are trying to send is virus infected. Go through all your configurations again and make sure the programs you are useing are allowed. Good Luck
136098
The addresses in question may be in your address book, but have you added those addresses to your accepted list?  If you, or your ISP has a spam blocker, then I would suggest that the mail is being blocked there.
330442
Perhaps you should send YAHOO an email about this concern. You can find further assistance at the following link:\nhttp://help.yahoo.com/help/us/mail/index.html
929441
It may be spam. Many hours are wasted due to spam email. However, by taking simple precautions while giving out your email and installing updated free software, you can prevent spam. More info available at\n http://fixit.in/stopspam.html
1078406
look in bulk box may be there If so click on not spam for that email. Go to options then filters see if address is listed. Also check blocked addresses. Note SPAM in yahoo goes to bulk
5666
It is very likely that your company has installed some default filters at the Exchange server level. You can't access those without permissions. You can however ask the system administrator to provide guidelines and training about what to avoid in your message subject and address lines and in the message body so that you will not trigger the filters for a legitimate message. A problem with all filters is that they do not exercise judgement. They simply execute code. Filters are set up to exclude things that "usually" are more likely in spam than in regular mail. They are a long way from perfect. If you know the rules that have been set up though you can dodge being filtered.
635690
If someone tries to send email messages to recipients with Yahoo! accounts, and they are using a server whose IP address is known to generate large amounts of spam or fraudulent messages, the messages may not even get a chance to get as far as the recipients' bulk mail folders.  Yahoo! may reject the messages immediately and silently because the sender's IP address is on a blacklist.
401793
basically you've sent your mail to an invalid email address and mailer daemon just notifies you that the message was not sent. :)
236193
There's a good chance the email address you are forwarding it to is invalid, closed (possibly filled up to its capacity) or no longer exists. There's also the rare possibility of server failure. You have to read the details in the email header and try and trace the path it took. There usually is a message why an email is returned to you amongst those details.
772417
Open /etc/postfix/main.cf, check "smptd_sender_restrictions". If it's empty, Postfix should accept all mail and send it.\n(Tip: Read about UCE at http://www.postfix.org/uce.html)
1045250
hmm.. what mail server do you use?  ask them for help.
456740
THey may have the IP of the place you are sending from blocked.\nTry sending your email from either another email account or another computer.