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Blocklists & Spam Monitoring
Suomispam Reputation: Email Blocklist Removal Guide
Finnish blocklist covering spam sources identified via local trap networks. Primarily used by Finnish ISPs and regional mail infrastructure.
smtpedia.com/suomispam-reputation-removal -
RFCs
RFC 4021: Registration of Mail and MIME Header Fields
Registers the full set of standard email header fields with IANA, providing a canonical reference.
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RFCs
RFC 5965: An Extensible Format for Email Feedback Reports
Defines the ARF (Abuse Reporting Format) used in Feedback Loop (FBL) complaint reports from mailbox providers.
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RFCs
RFC 2142: Mailbox Names for Common Services, Roles and Functions
Defines standard role mailboxes every domain should maintain: postmaster@, abuse@, hostmaster@, etc.
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RFCs
RFC 7505: A Null MX No Service Resource Record for Domains That Accept No Mail
Defines the Null MX (0 .) record that explicitly signals a domain accepts no incoming mail, preventing delivery loops.
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RFCs
RFC 3282: Content Language Headers
Defines the Content-Language header for indicating the natural language of message content.
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RFCs
RFC 2369: The Use of URLs as Meta-Syntax for Core Mail List Commands
Defines List-Unsubscribe, List-Help, List-Post and other headers for automating mailing list management.
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RFCs
RFC 2919: List-Id: A Structured Field and Namespace for the Identification of Mailing Lists
Defines the List-Id header for uniquely identifying mailing lists, used by email clients to organise list mail.
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Compliance & Laws
Germany Data Protection Authority: All What You Need to Know
The Bundesbeauftragte für den Datenschutz und die Informationsfreiheit (BfDI) is Germany's federal data protection commissioner, with 16 state DPAs handling private-sector processing. Complete 2026 reference covering federal + state structure, strict double-opt-in…
smtpedia.com/germany-data-protection-authority-bfdi -
Unsubscribe Guides
How to Add a Customer.io Unsubscribe Link: The Complete 2026 Setup Guide
Complete guide to the Customer.io unsubscribe link: {% include 'unsubscribe' %} placement, Message Group scoped opt-outs, transactional API header injection, RFC 8058 one-click compliance.
smtpedia.com/customer-io-unsubscribe-link
