- #HOW TO SEND MASS EMAILS FREE WITHOUT GETTING BLACKLISTED HOW TO#
- #HOW TO SEND MASS EMAILS FREE WITHOUT GETTING BLACKLISTED FULL#
(that example has been plucked from a genuine spam message in my junk pile) As an example, SpamAssassin based filters inject headers of the following form: X-Spam-Flag: YES
#HOW TO SEND MASS EMAILS FREE WITHOUT GETTING BLACKLISTED FULL#
So if you look at the full source of the messages they did get moved to junk folders you may find useful clues. I don't know specifically about outlook as I don't use it anywhere myself, but many mail filters inject headers into messages to list what filters were used, what the result was, and what the weighting given to that filter was. As you are having specific problems with a particular client there may be things the program can tell you. To be a little less negative and more helpful. I no longer consider email to be the half-way-reliable transport method it once was. Basically spam has driven ISPs and users into a situation where they sometimes make it difficult for such legitimate messages (especially bulk messages such as your newsletter) to get through.
#HOW TO SEND MASS EMAILS FREE WITHOUT GETTING BLACKLISTED HOW TO#
Unfortunately there are many different filtering techniques and some major mail providers won't publish what they use and/or what weights are given to various tests/filters, so knowing how to get through is difficult. These help with deliverability, but are not required (not by the vast majority of e-mail servers). Optionally you should consider setting up SPF, DKIM, and DMARC. This is one of my biggest pet-peves with valid newsletters I want to receive ending up in Junk because they fake an Outlook Express header, leave out the date, or something similar. These services generally have guidelines for improving your reputation, but are not an outright "go/no-go" like RBLs.ĭon't fake headers, don't lie in headers, and make sure you're including the minimum headers in messages ( Date and From are required, there should be a Subject, Sender, Reply-To, and To/ Cc/ Bcc ). If it is, get that taken care of.Ĭheck the reputation of your IP with the more popular reputation services (SenderScore is a big one right now, but that might not hold up over time). Make sure your IP address isn't on any DNSRBLs (blacklists). Your server should not be sending an IP address. Make sure your server is actually sending the hostname in that handshake. Similarly the reverse lookup of that IP should return the name. A mail server has to identify itself in a HELO/EHLO exchange, that name should lookup to the IP the server is using. Make sure you have forward and reverse DNS configured correctly. These minimums are essentially required these days: "John Doe" ) and monitor your abuse accounts, such as and question mentions that the basics are in place, but as we're pointing others to this as a Canonical Question I just want to be sure we cover our bases. Use the full, real name of the addressee in the To field, not just the email-address (e.g.
Make sure that the reply-to address of your emails are a valid, existing addresses. Also check your reverse DNS to make sure the IP address of your mail server points to the domain name that you use for sending mail. The nice side-effect is you help in preventing that your email domain is spoofed. Use email authentication methods, such as SPF, and DKIM to prove that your emails and your domain name belong together. Some mail servers don’t accept large sending batches or continuous activity. If you don’t know your SMTP servers in advance, it’s a good practice to provide configuration options in your application for controlling batch sizes and delay between batches.
IP addresses of spamming SMTP servers are often blacklisted by other providers. On the technical side: if you can choose your SMTP server, be sure it is a “clean” SMTP server. Otherwise, your users will unsubscribe by pressing the “spam” button, and that will affect your reputation. Make it really easy to unsubscribe or opt-out. Write your communication as you would write a normal email. Be sure that your emails don’t look like typical spam emails: don’t insert only a large image check that the character-set is set correctly don’t insert “IP-address only” links.
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