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https://issues.apache.org/jira/browse/MAILET-30?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984150#action_12984150
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Stefano Bagnara commented on MAILET-30:
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Here was my comment from mailet list:
---
dns queries: SPF, whitelists, blacklists, DKIM. There are a lot of
mail processing nowadays requiring dns calls. Mailets could use java
dns resolver but we know that from a server point on view it is better
to work with dnsjava: if we provide some generic api to run a dns
query then each container will be able to decide how to implement it
and mailets would be easier and more portable.
---
And here an answer from Norman:
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+1. But do make it really usable for all kind of mailets/matchers we
would need to allow to query for all kind of records. Something like:
List<String> lookup(String address, DNSType type) throws
TemporaryLookupException, LookupException;
enum DNSType {
A.,
MX,
AAAA,
.......
}
We also should adjust the other DNS calls in MailetContext to throw
such exceptions.
---
> Add support for DNS querying via MailetContext
> ----------------------------------------------
>
> Key: MAILET-30
> URL: https://issues.apache.org/jira/browse/MAILET-30
> Project: Mailet
> Issue Type: Improvement
> Components: Core API
> Affects Versions: 2.4
> Reporter: Stefano Bagnara
> Fix For: 2.5
>
>
> DNS lookups are very frequent in the mail world (blacklists, authentication,
> whitelists).
> We know standard java DNS is not good about caching so we should provide a
> way for mailets to do the lookup and leave to container implementors the
> choice on how to deal with caching.
> Let's collect our use cases first and propose a small api change.
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