# Email Forwarding: Why Messages Sometimes Land in Spam (and How to Improve It) When using our email forwarding service, you may occasionally find that some emails land in the recipient’s Spam/Junk folder. This article explains how our forwarding works, why spam can still happen even with proper authentication, and what you can do to improve deliverability. --- ## How Our Email Forwarding Works All forwarded messages are sent **from**: **forwarded@op-email.eu** To keep reply behavior natural, we set the **Reply-To** header to the **original sender’s address**. That means: - The recipient sees the message from forwarded@op-email.eu. - If they click **Reply**, their email client automatically addresses the reply to the **original sender**. - The original sender information is preserved in headers for traceability. Why this approach? Using a fixed, authenticated sender ensures strong SPF/DMARC alignment with our domain (op-email.eu), improving consistency across providers. --- ## What We Do to Support Deliverability - SPF: All outbound IPs are authorized under the SPF record for op-email.eu. - DKIM: Forwarded messages are DKIM-signed by op-email.eu. - DMARC: Evaluates against op-email.eu and will pass via SPF or DKIM alignment. - **Consistent envelope**: A single, authenticated sender reduces false positives with strict filters. > Note: Any original DKIM signature from the source sender may not validate after forwarding because some headers change. The message remains authenticated via our op-email.eu DKIM/SPF. --- ## Why Emails May Still Go to Spam - **Email content & formatting**: Spam-like language, suspicious links, or risky attachment types can trigger filters. - **Original sender reputation**: A poor reputation for the original sender’s domain/IP can influence filtering. - **Recipient mailbox algorithms**: Providers (e.g., Gmail/Outlook) weigh user behavior, past engagement, and proprietary signals. - **Low engagement**: If recipients rarely open or interact with your messages, providers may downrank future emails. --- ## What You Can Do - Allowlist: Ask recipients (or their IT) to allowlist op-email.eu or specifically forwarded@op-email.eu. - **Mark “Not Spam”**: When misclassified, marking as “Not spam” trains the mailbox provider. - **Improve content quality**: Avoid spammy phrases, link shorteners, or executable attachments; keep a healthy text-to-image ratio. - **Encourage best practices**: Ask frequent senders to maintain valid SPF/DKIM for their own domain and avoid spam-triggering content. - **Consider direct mailbox access**: For the highest deliverability control, use IMAP/POP to read the mailbox directly (see below). --- ## Alternative: Use Direct Mailbox Access For best results and full control (no forwarding involved), connect your email client directly to the mailbox via **IMAP/POP3**: - Setup guide: [https://openprovider.help/books/email-solution/page/what-are-the-configuration-settings-for-setting-up-openprovider-email-solution-on-various-email-clients](https://openprovider.help/books/email-solution/page/what-are-the-configuration-settings-for-setting-up-openprovider-email-solution-on-various-email-clients) - Provider-specific help: Gmail – [https://support.google.com/mail/answer/6304825?hl=en](https://support.google.com/mail/answer/6304825?hl=en) Yahoo – [http://help.yahoo.com/kb/SLN28341.html](http://help.yahoo.com/kb/SLN28341.html) This avoids forwarding-related heuristics and keeps authentication tied to the mailbox provider end to end. --- ## FAQs Will recipients always see forwarded@op-email.eu as the sender? Yes. That’s by design for authentication consistency. Replies will still go to the original sender via the Reply-To header. Does this pass DMARC? Yes. DMARC aligns to op-email.eu (the visible From domain). We sign with DKIM and authorize SPF for that domain. Can we still trace the original sender? Yes. The original From address is placed in **Reply-To** and preserved in standard headers so recipients and mail admins can see who originated the message.