| name | version | notes |
|---|---|---|
| postfix | 3.10 |
| name | notes |
|---|---|
| multirbl.valli.org | |
| anti-abuse.org | |
| multirbl.net |
| name | notes |
|---|---|
| learndmarc.com | |
| mail-tester.com | |
| auth@verifier.port25.com | |
| dkimvalidator.com |
| name | notes | type |
|---|---|---|
| emailregex.com | regular expression tester | |
| regular-expressions.info | regular expression guidance |
| name | notes |
|---|---|
| spamhaus | |
| spameatingmonkey | |
| spamcop | |
| mailspike | |
| dnswl.org |
| resource | summary |
|---|---|
| RFC 5321 | Simple Mail Transfer Protocol |
| RFC 5322 | Internet Message Format |
| RFC 6854 | Update to Internet Message Format |
| RFC 7208 | Sender Policy Framework (SPF) |
| RFC 7372 | Email Authentication Status Codes |
| RFC 6376 | Domain Keys Identified Mail (DKIM) Signatures |
| RFC 7489 | Domain-based Message Authentication, Reporting, and Conformance (DMARC) |
| RFC 8616 | Email Authentication for Internationalized Mail |
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pull requests are welcome!