Deliverability issues: Sending IP listed on SpamCop and configuration alignment
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Hi Support Team,
We are experiencing severe deliverability issues with our domain. Most of our legitimate emails are currently landing in the spam folder (especially on Gmail and Outlook).
We ran a full header and deliverability test using Mail-Tester, and we found a few critical issues originating from your platform's infrastructure and template rendering:
- IP Blacklisted on SpamCop & Hostkarma Your sending IP 185.3.229.125 is currently blacklisted. SpamAssassin triggered the following heavy penalty:
-1.246 RCVD_IN_BL_SPAMCOP_NET (Received via a relay in bl.spamcop.net)
- Domain Alignment (Return-Path) SpamAssassin flagged a misalignment between our visible domain and the envelope domain:
-0.249 HEADER_FROM_DIFFERENT_DOMAINS (From and EnvelopeFrom 2nd level mail domains are different)
- Preheader / Zero-Width Spaces Injection When looking at the raw text source of the emails generated by your system, we noticed a massive injection of zero-width spaces and invisible characters at the end of the preheader line (encoded as =E2=81=A0=E2=80=8C=C2=A0...). Modern anti-spam filters (especially Gmail) are flag-triggering this specific technical layout as a spam technique. How can we disable or cleanly override this automatic whitespace injection in your template builder?
Thank you for your prompt support in resolving these infrastructure and delivery issues.