There are 3 main reasons why your email probably wasn't delivered:

1. The ISP is using a content filter and has determined that your email exceeds their "might be spam" threshold. Some ISPs are stricter than others. Read our tips on avoiding spam filters .
2. The ISP is using a blacklist which our mail servers might appear. Like all commercial email solutions, there is a chance that our servers could be listed on a blacklist (although this happens VERY rarely). Getting your email delivered is our number one concern, so if we are on a blacklist, rest assured that we are working hard to be removed from that list.
3. The subscriber has chosen tight spam controls in the email client they are using - perhaps to block all email from unknown senders. Your email may have been delivered but, due to tight spam controls, it may have ended up in the spam or bulk folder and the recipient may have missed it.

Related Topics

• What terms should I avoid in my email content to reduce the chances of it being marked as Spam?
• What do the different types of hard and soft bounces mean?

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