In the context of email marketing, blacklisting refers to a practice where an email address or an entire domain is added to a blacklist, resulting in emails being blocked or marked as spam. Avoiding blacklisting is crucial for ensuring the deliverability of emails and maintaining a positive sender reputation.
Several factors contribute to blacklisting, including poor email practices such as sending spam, having a high bounce rate, or using misleading or deceptive subject lines. Additionally, technical issues like sending emails from an unauthenticated domain or using insecure protocols can also lead to blacklisting.