#Assp vs spamassassin verification
Note: setting a limit means that verification may succeed even if extra data is appended to the message somewhere in transit. Impose body hash length limit: this allows you to limit how much of the message body will be used in the body hash.The simple algorithm is stricter and will cause verification to fail if the message is changed at all in transit, whereas the relaxed algorithm will tolerate some whitespace insertion. Canonicalization algorithm: this can be set independently for the headers and the body.Encryption algorithm: choose which algorithm will be used for signing the headers hash.Check the Sign outgoing messages box to enable message signing.Select the DKIM tab and click the Configure button.Right-click on the domain you wish to configure DKIM for and select Properties.Navigate to within the administration console to: MailEnable management > Messaging Manager > Post Offices > (postofficename) > Domains.Tick the option for Enable DomainKeys Identified Mail (DKIM) functionality on this server.Right click on Domain Keys (DKIM) and select properties.Navigate to the following location within the administration console: Servers > Localhost > Extensions.The only real disadvantage is the extra time it takes to process each message, since signing and verifying both involve relatively expensive cryptographic calculations and verifying requires a lookup of the sender's DNS records. This provides extremely strong assurance of a message's fidelity and authenticity, since any change to the message's headers or body will cause verification to fail. The message is signed before sending by encrypting a hash of its headers using public key encryption and then verified upon receipt by decrypting the signature using a public key (provided by the sender in a DNS record) and comparing the hash.
DKIM provides a mechanism for verifying the integrity of a message.
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