helo

Documentation

Index

• Constants
• Variables
• func DenyBareIP(transaction *msmtpd.Transaction) error
• func DenyDynamicIP(transaction *msmtpd.Transaction) error
• func DenyMalformedDomain(transaction *msmtpd.Transaction) error
• func DenyReverseDNSMismatch(transaction *msmtpd.Transaction) (err error)
• func HateForRDNSMismatch(howMuch uint) msmtpd.HelloChecker
• func SkipHeloCheckForLocal(transaction *msmtpd.Transaction) error

Constants

const DefaultHateForReverseDNSMismatch = 3

DefaultHateForReverseDNSMismatch is how much we punish by default for Reverse DNS mismatch

const IsLocalAddressFlagName = "addr_is_local"

IsLocalAddressFlagName is flag name to mark local remote addresses

Variables

var TopListDomains []string

TopListDomains is array of top list domain suffixes

Functions

func DenyBareIP

func DenyBareIP(transaction *msmtpd.Transaction) error

DenyBareIP denies clients which provide bare IP address in HELO/EHLO command

func DenyDynamicIP

func DenyDynamicIP(transaction *msmtpd.Transaction) error

DenyDynamicIP ensures helo/ehlo does not contain parts if connection IP address like ISP usually do with residential and dynamic IP addresses

func DenyMalformedDomain

func DenyMalformedDomain(transaction *msmtpd.Transaction) error

DenyMalformedDomain checks, if domain in HELO request belongs to top list domains like .ru, .su and so on

func DenyReverseDNSMismatch

func DenyReverseDNSMismatch(transaction *msmtpd.Transaction) (err error)

DenyReverseDNSMismatch is complicated and very strict test which ensures that 1. HELO/EHLO matches any of PTR records resolved for connecting IP 2. PTR records of connecting IP are resolved (aka have DNS A records) into IP addresses including connecting IP This test prevents delivery from majority small GI domains, which are known to be spammy.

func HateForRDNSMismatch

func HateForRDNSMismatch(howMuch uint) msmtpd.HelloChecker

HateForRDNSMismatch is less strict version of DenyReverseDNSMismatch that only applies negative karma for failed RDNS check

func SkipHeloCheckForLocal

func SkipHeloCheckForLocal(transaction *msmtpd.Transaction) error

SkipHeloCheckForLocal allows local clients provide anything in HELO/EHLO