Re: RegularExpressionValidator and fake email addresses

Hello James,

There are many components out there which you can use to test for email
address correctness and existence. All of them perform a sort of check
against the smtp server responsible for the provided email address, if
one exists. Here is a short list of products you could use within your
ASP.NET projects:

http://www.emailverify.net
http://www.aspnetmx.com
http://www.hexillion.com

Personally I would opt for EmailVerify.NET, which is a project I'm
currently involved in, because it also supports a sort of false positive
check (used for smtp servers with anti-spam feature turned on) and, btw,
is cheaper than the other two.
Keep in mind, however, that in the end there is no a 100% guarantee that
an email address does actually exist until you send a message and check
for a possible bounce. And even if you send a message, there is no
guarantee a bounce will be sent in the event the recipient does not
actually exist. So, use these components with care.

Hope this helps.

--
Efran Cobisi
http://www.cobisi.com

James Hearne wrote:
> No, this isn't applicable. I don't want to send out any email. I just
> want
> to check if the provided email address does exist or not.
> How can I do that?
>
> /James
>
> On 5/24/07, Paul van Brenk <[email protected]> wrote:
>>
>> Send an email to confirm their subscription.. all addresses that are not
>> yet confirmed are not valid and deleted after 48 hrs?
>>
>> Paul
>>
>> -----Original Message-----
>> From: Discussion of building .NET applications targeted for the Web
>> [mailto:[email protected]] On Behalf Of James Hearne
>> Sent: Thursday, May 24, 2007 15:48
>> To: [email protected]
>> Subject: [DOTNET-WEB] RegularExpressionValidator and fake email
>> addresses
>>
>> Hi gurus,
>> in our web site we often receive a lot of feedback from fake email
>> addresses, like [email protected]; people sign up to our newsletter
>> using
>> fake addresses too.
>> Very bad...
>> In each page used to enter email addresses we have already inserted
>> a RegularExpressionValidator which works quite well; the problem is that
>> email addresses like the aforementioned one are actually valid ones!
>>
>> Could you point me to the right direction?
>> Thanks.
>>
>> /James
>>
>> ===================================
>> This list is hosted by DevelopMentor(r)  http://www.develop.com
>>
>> View archives and manage your subscription(s) at
>> http://discuss.develop.com
>>
>> ===================================
>> This list is hosted by DevelopMentor(r)  http://www.develop.com
>>
>> View archives and manage your subscription(s) at
>> http://discuss.develop.com
>>
>
> ===================================
> This list is hosted by DevelopMentor®  http://www.develop.com
>
> View archives and manage your subscription(s) at
> http://discuss.develop.com

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com