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Hi Spam,
Yeah, you're going to have a problem determining if
email addresses are actually valid, but outside of the JavaMail API you could do
DNS queries, one to see if the recipient domain exists, and then to see if there
is a registered mail exchanger for the domain. If either fails, drop the
mail.
Doing validity checks based on domains greatly
increases the feasibility of checking the validity of email addresses if you
archive results per domain with a time to live factor, that way you dont have to
validate each and every email address assuming each address is not at a unique
domain name.
The other problem you are going to have especially
if you are sending out 1000's of mails every day is the IP addresses for your
JavaMail program. If these IP addresses are not listed as mail exchangers in the
dns record for your domain you will find that a lot (and ever increasing number)
of mail exchangers on the internet will reject your mail. So get your JavaMail
ip's into your MX record. However, if you're sending out 1000's of mails every
day, then in all probability you are sending out UCE, and you will probably have
to change IP's regularly, as many mail exchangers will decide not to accept mail
from you anyway once your IP is associated with UCE.
If by some chance your client is ASP'ing a UCE
service, then you should track message bounces so that those addresses can be
removed from the lists of 1000's of addresses.
Before the flame war starts, I hope I havent
offended / misinterpreted you or your clients motives. Either way, the technical
content is equally valid and points you in exactly the right way to go about
your problem. Sample code.... I'm sure we can exchange some in return for a
commercial agreement, contact me offlist if interested.
In terms of EJB-Interest, your mailings are a
little OT, http://forums.devshed.com/forumdisplay.php?forumid=36 might
be more appropriate in light of my take on your problem and route to sucess, but
thats just the first hit I got from google, so digging a little deeper there
might turn up somthing more useful.
HTH,
-Enda.
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- Validating Email Address ssmtech
- Re: Validating Email Address Vikramjit Singh
- Validating Email Address ssmtech
- Enda
