Do you have this user registered at your site with an email address?
There is no way to "test" a existing email with ex. google or other
email hosts. (The smtp protocol allows for this but its a spam trap to
have this available... )
You do have the ability to test if the domain exists and is a valid
domain.. But again this can't be 100% because not all servers allow
this inquiry and your connection to them might timeout
This would validate the domain (but could fail if you timeout.. ):
require 'resolv'
def validate
unless errors.on(:email)
unless valid_domain?(email)
logger.debug "[DEBUG] - Domain name #{email} has a problem."
errors.add(:email, 'domain name appers to be incorrect')
end
end
end
def valid_domain?(email)
domain = email.match(EMAIL_PATTERN)[2]
dns = Resolv::DNS.new
Timeout::timeout(SERVER_TIMEOUT) do
# Check the MX record
mx_records = dns.getresources(domain,
Resolv::DNS::Resource::IN::MX)
mx_records.sort_by {|mx| mx.preference}.each do |mx|
a_records = dns.getresources(mx.exchange.to_s,
Resolv::DNS::Resource::IN::A)
return true if a_records.any?
end
#Try a straight A record
a_records = dns.getresources(domain, Resolv::DNS::Resource::IN::A)
a_records.any?
end
rescue Timeout::Error, Errno::ECONNREFUSED
false
end
Using a pattern is faster and just plain easier...
EMAIL_PATTERN = /\A([EMAIL PROTECTED])@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i
validates_format_of :email, :with => EMAIL_PATTERN
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