Email validation

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Hello to you all!

I'm facing a problem with a scrip that can validate a form witch accept only
as input email address.

I have seen many scripts on the net and were very interesting but I'm not
able to implement those scripts on my need.

I'm explaining myself better!

I have a form to collect a User Input Email address,

After a script to check the syntax of the user email is correct.

Then check the mx record if really exist.

At the end if the user input (email) meets all my requirements the pass it
(store) in a DB.

Please I'll be grateful to all your possible solutions

Thanks.




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Re: Email validation

On 28 June 2010 15:42, gmail wrote:
> Hello to you all!
>
> I'm facing a problem with a scrip that can validate a form witch accept o=
nly
> as input email address.
>
> I have seen many scripts on the net and  were very interesting but I=
'm not
> able to implement those scripts on my need.
>
>  I'm explaining myself better!
>
> I have a form to collect a User Input Email address,
>
> After a script to check the syntax of the user email is correct.
>
> Then check the mx record if really exist.
>
> At the end if the user input (email) meets all my requirements the pass i=
t
> (store) in a DB.
>
> Please I'll be grateful   to all your possible solutions
>
> Thanks.
>
>
>
>

How much detail do you want?

Validating email addresses goes from the mundane to the extreme. The
rules on the EXACT format of an email address are significant. Reading
http://en.wikipedia.org/wiki/E-mail_address#RFC_specificatio n will
give you a lot of detail.

There are MANY regular expressions available, again, covering some
aspects of a "valid" email address. Some cover more than others.

http://www.regular-expressions.info/email.html has a good explanation
regarding email address validation using regular expressions (and is
part of the RegexBuddy documentation).

Note the last line ...

"So even when following official standards, there are still trade-offs
to be made. Don't blindly copy regular expressions from online
libraries or discussion forums. Always test them on your own data and
with your own applications."



As for the MX part, PHP has the getmxrr() function for this task -
http://docs.php.net/manual/en/function.getmxrr.php

There are also a lot of user notes covering email address validation.

Richard.



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Richard Quadling
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Re: Email validation

Hello,

on 06/28/2010 11:42 AM gmail said the following:
> Hello to you all!
>
> I'm facing a problem with a scrip that can validate a form witch accept only
> as input email address.
>
> I have seen many scripts on the net and were very interesting but I'm not
> able to implement those scripts on my need.
>
> I'm explaining myself better!
>
> I have a form to collect a User Input Email address,
>
> After a script to check the syntax of the user email is correct.
>
> Then check the mx record if really exist.
>
> At the end if the user input (email) meets all my requirements the pass it
> (store) in a DB.
>
> Please I'll be grateful to all your possible solutions

You may want to use this email validation class that tries to check if
the e-mail is valid with the destination SMTP server.

http://www.phpclasses.org/emailvalidation


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Manuel Lemos

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