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    <p>1) Normally an email address won't go easily into a blacklist, it takes time and/or a lot of people to tag you as spammer to actually get that address into a blacklist.</p> <p>2) Yes. A whole domain name can be blacklisted, because spammers normally generate random email addresses like f4j3ifl@something.com.</p> <p>3) It doesn't matter how many times it went to the spambox, basically, the spam filters nowadays are strong, because spammers try to improve their ways to get around day by day, so the filters gets more strict every day. If it goes into spam folder first time, and the user didn't actually put it into the spam box, it will continue going unless users unmark it, or you fix the troubles.</p> <p>How to avoid spambox?</p> <p>Basically you need some signatures, and a lot of access to your DNS records, because there is where we are going to do most of the setups.</p> <ul> <li><p><strong>Reverse DNS Lookup</strong>: On dedicated servers or even on some VPS you are able to set up a reverse dns record, sometimes you just open a ticket and the IT's set it up for you. If you can't have it, change your hosting or keep being tagged as spammer xD. This is to preven header forgeries, as you could set on your headers that your email comes from gmail.com but it doesn't this is the way the email servers check it.</p></li> <li><p><strong>SPF is a must have as well</strong>, if you can't set a SPF then don't even try any further, consider changing your hosting, and you can almost stop reading by here xD.</p></li> <li><p><strong>DKIM/Domain Key</strong>: preferably DKIM, is a encrypted signature, you set the public key on the DNS, and store a private key in your email server, when a server receives an email, it has the private key attached in the headers (you need a mailserver software which manages DKIM, for windows for example it worked for me <em>hmailserver</em>) and the mail service (gmail for example) will check your dns record to see if the public key matches. <strong>This is almost a must have as well</strong></p></li> </ul> <hr> <p>Those three were the basics, if you Set up DMARC and ADSP it will get you better score for the SpamAssassins. To get a even better score search for some spam keywords lists on google and try to avoid them, some stuff like starting an email with "Dear xxx" are harmful for your score, Set up the unsuscribe system(even if it's crappy, as long as you provide a clear link) will help you a bit as well.</p> <p>Also:</p> <ul> <li><p>Avoid sloppy html and white text over (any) backgrounds, some spammers use it to fit in hidden text, those filters are smarter than you think.</p></li> <li><p>Read the specific recommendations. Most email services have a FAQ or something in their website with some tips to help you sending emails and not going into the junk. on Some of them you can even apply for getting into a white list ( at least some years ago, on some services like gmail they don't do it anymore)</p></li> <li><p>If you are sending in bulk, watch the time! If you have X emails per second sent into somewhere, you are likely to get into blacklist, set up a script or something to get a 1sec delay or so, the delay might depend on the destinatary to get into the blacklist or not.</p></li> </ul> <hr> <p>Hope those tips help you, I had to deal with some spam filters recently and it's a pain in the ass, that's why I know all that info, that's all my research xD Even after all the signatures and things I have set up, some of the emails are still going into spambox(a smaller percentage but it still hurts me) The only reliable way is to get the users adding you to the contacts list (while having the signatures and headers correctly), so remind them to do so if possible.</p>
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    1. COHmm... My question was, if I could send mails from One.com's domain, where it itsn't possible to change the SPF-record or the DKIM-record. So what you're saying is, that it isn't possible, since I can't change the SPF-record or the DKIM-record? If not, then what do you suggest? Move to a whole new webspace because of this tiny issue (that has turned huge)? <br /> I added what my header looks like now. It says something with SPF-neutral, or something like that, but I don't have a clue if it means that it's set or not (or approved or not).
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    2. COYes, it means that you would have to change the domain's service and/or the web hosting. The email spamming isn't a that small issue if you are facing a lot of users that are not from a known network. The neutral SPF-record means that the server detects that you have spf-record set, but it doesn't match or have all the information needed, so think of as it's not set correctly. And yes, it sucks that nowadays you need so complex setups for such basic things as emails, all because of spammers...
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    3. CODamnit... But thanks. I'll consider what other options I have, before I'll do that. That is quite a lot of work, for something so simple...
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