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internet:mail:sender_auth [2019/05/07 10:18] gcooper |
internet:mail:sender_auth [2019/05/08 08:48] (current) gcooper |
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- | ====== DKIM and DMARC ====== | + | ====== |
+ | |||
+ | FIXME Incomplete | ||
SPF (sender policy framework), DKIM (domain keys identified mail) and DMARC (domain message authentication reporting and conformance) are **sender authentication mechanisms** that use DNS. | SPF (sender policy framework), DKIM (domain keys identified mail) and DMARC (domain message authentication reporting and conformance) are **sender authentication mechanisms** that use DNS. | ||
+ | |||
+ | ===== Testing ===== | ||
+ | |||
+ | **Various Tools**: https:// | ||
+ | |||
+ | **DKIM Test Tool**: https:// | ||
+ | |||
+ | **DMARC Test Tool**: https:// | ||
+ | |||
+ | A very useful test is to **send a message from the domain under test to a Gmail address**. | ||
+ | |||
+ | |||
+ | ===== SPF ===== | ||
+ | |||
+ | SPF is the most widely used sender authentication mechanism. | ||
+ | |||
+ | A DNS SPF (TXT) record just tells the recipient server which sender servers are authorized to send e-mail for a particular domain. | ||
+ | |||
+ | ==== Virtualmin ==== | ||
+ | |||
+ | **Virtualmin -> < | ||
+ | |||
+ | {{ : | ||
===== DKIM ===== | ===== DKIM ===== | ||
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Signing is done with a **private key on the sender' | Signing is done with a **private key on the sender' | ||
- | ===== Testing ===== | + | ==== Virtualmin |
- | **DKIM Test Tool**: https:// | + | <note warning> |
- | **DMARC Test Tool**: | + | https://www.virtualmin.com/documentation/ |
- | A very useful test is to send a message from the domain under test to a Gmail address. | + | Virtualmin uses a **milter** (daemon) |
+ | **Virtualmin -> E-Mail Settings -> DomainKeys Identified Mail** | ||
+ | {{ : | ||
- | ===== Virtualmin ===== | + | ==== Zimbra |
- | https://www.virtualmin.com/ | + | <note tip> |
- | ===== Zimbra ===== | + | **Important**: |
- | + | ||
- | https:// | + | |
https:// | https:// | ||
+ | |||
+ | ===== DMARC ===== | ||
+ | |||
+ | < | ||
+ | |||
+ | DMARC is a mechanism to tell receiving mail servers exactly how to treat failures of SPF and DKIM checks. | ||
+ | |||
+ | DMARC also includes a mechanism to report failures back to administrators of sender domains. |