Root Causes Tied to Dirty Lists

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Complaints and Engagement: If your spam complaints are up and your open rates are significantly down, it's a strong indicator that your emails are not reaching the primary inbox. If your actual subscribers are telling you they're not seeing your emails, trust them.

Low Sender Score/Reputation: This is the primary driver. If your sender reputation is low due to consistently high bounce rates, numerous spam complaints, or hitting spam traps, ISPs will view your emails with suspicion and route them to spam. ISPs prioritize the experience of their users, mexico email list and a poor sender reputation signals potential abuse.
Triggering Spam Filters: While content (spammy keywords, excessive images, broken HTML) and technical configuration (SPF, DKIM, DMARC records) play a significant role, a dirty list often contributes to overall sender reputation, making even well-crafted emails susceptible to filters. Sending to known invalid addresses can also trigger spam filter algorithms that penalize lists with high invalidity.
Blacklisting: If your sending IP or domain is blacklisted (covered next), your emails will almost certainly land in spam or be outright blocked by many providers.
C. Being Blacklisted by ISPs and Anti-Spam Organizations
Blacklisting is a severe consequence of poor email list hygiene and sending practices. When your IP address or domain is listed on a blacklist, it means major ISPs and email providers have identified you as a potential source of spam.

What is Blacklisting? Blacklists are publicly available or privately maintained databases of IP addresses and domains known or suspected to send spam or unsolicited mail. Examples include Spamhaus, SURBL, SORBS, SpamCop, and Barracuda. When your IP or domain is on such a list, email providers will block or severely filter all emails originating from it.
Why It Happens (Dirty List Connection):
Chronic Poor List Hygiene: Persistent high hard bounce rates and a high volume of persistent soft bounces indicate a failure to remove invalid or inactive addresses from your list. This suggests you are sending to non-existent or ignored recipients.
High Complaint Rates: A consistent stream of spam complaints from recipients indicates a severe lack of recipient consent and is a major trigger for blacklisting.
Sending to Spam Traps: Hitting even a single carefully maintained (pristine) spam trap can result in immediate blacklisting. These addresses are designed to catch spammers and are never legitimately subscribed to any list. Hitting them signifies that your list was likely purchased, scraped, or acquired through unethical means. Even recycled spam traps (old, abandoned addresses that have become traps) signal poor list hygiene.