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https://issues.apache.org/jira/browse/VALIDATOR-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14936448#comment-14936448
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Jochen Wiedmann commented on VALIDATOR-376:
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Gut reaction (and without validating feasability):
Optionally perform a DNS lookup for MX records. Below you find an example, how
a DNS lookup from the command line reveals a meaningful reply in the case of
"gmail.com", but not in the case of "gmail".
Important part: Make this optional. There are a multitude of scenarios, where
DNS lookups will not be possible.
-bash-3.2$ nslookup -type=mx gmail
Server: 85.214.7.22
Address: 85.214.7.22#53
Non-authoritative answer:
gmail mail exchanger = 10 your-dns-needs-immediate-attention.gmail.
Authoritative answers can be found from:
your-dns-needs-immediate-attention.gmail internet address = 127.0.53.53
-bash-3.2$ nslookup -type=mx gmail.com
Server: 85.214.7.22
Address: 85.214.7.22#53
Non-authoritative answer:
gmail.com mail exchanger = 40 alt4.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 10 alt1.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 20 alt2.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 30 alt3.gmail-smtp-in.l.google.com.
gmail.com mail exchanger = 5 gmail-smtp-in.l.google.com.
Authoritative answers can be found from:
alt3.gmail-smtp-in.l.google.com internet address = 173.194.72.27
alt1.gmail-smtp-in.l.google.com internet address = 74.125.68.26
alt2.gmail-smtp-in.l.google.com internet address = 74.125.23.26
alt4.gmail-smtp-in.l.google.com internet address = 74.125.25.26
gmail-smtp-in.l.google.com internet address = 74.125.136.26
> EmailValidator says addresses such as x.y@gmail are valid although most mail
> apps will fail to send it
> ------------------------------------------------------------------------------------------------------
>
> Key: VALIDATOR-376
> URL: https://issues.apache.org/jira/browse/VALIDATOR-376
> Project: Commons Validator
> Issue Type: Bug
> Components: Routines
> Affects Versions: 1.4.1 Release
> Reporter: Ralph Goers
>
> The VALIDATOR-273 patch causes EmailValidator to allow addresses such as
> x.y@gmail. Unfortunately, this is causing us problems as none of the email
> apps we have tried will actually allow that email address to be sent.
> Although the RFCs may state it is valid, in practice it apparently isn't.
> Some sort of option is needed to allow providing just the domain to fail. As
> a consequence we have had to revert to a prior release of commons-validator.
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