Jim is absolutely correct about filtering your invalid emails, though I personally would never do it automatically, as there are too many variables to distinguish between ISP's that are subject to change. You could lose a lot of valid subscribers via automated filtering. The bounces that come back to my server are piped to an email account on the server. I then use a program to download them manually <http://www.boogietools.com> , the program filters and separates them into categories such as hard bounces, soft bounces and mail blocks. I then decide which ones to remove from my lists, at this present time soft, hard, general, and transient bounces are removed. However there is one automated program I know of here <https://www.inboxresponse.com> . You just can't keep sending without filtering out the bad ones, it will get you blocked, banned, and blacklisted, so this is a high priority issue. You should also make sure that you have reverse dns correctly set up as well as a spf record <http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/> . You can check your servers black listings here <http://multirbl.valli.org> , and you will see if your RDNS is currently set up correctly. You should also consider setting up feedback loops with Hotmail <http://mail.live.com/mail/troubleshooting.aspx> and AOL <http://postmaster.aol.com/Postmaster.Reputation.php> . As well as some of the other suggestions they may have individually. With AOL you can apply for whitelisting after you have a feedback loop in place. With Hotmail, there is a feedback loop <https://support.msn.com/eform.aspx?productKey=edfsjmrpp&page=support_home_options_form_byemail&ct=eformts> , an account with Smart Network Data Services <https://postmaster.live.com/snds/index.aspx> , Return Path <http://www.returnpath.net> , which are free. You will need a hotmail email account for the SMDS. The bulk sender contact form for Gmail is here <https://support.google.com/mail/contact/bulk_send> . You can contact Yahoo here <http://help.yahoo.com/l/us/yahoo/mail/postmaster/bulkv2.html> , but that requires a yahoo account, you must be signed into your account when using this form, otherwise nothing will happen. Also check out SPF vs Sender ID <http://www.openspf.org/SPF_vs_Sender_ID> Other than that, welcome to an ongoing headache!
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