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Checking legal email address string

Posted on 1998-07-03
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Last Modified: 2012-05-04
In my C++ program I need to check whether or not a string is a legal email address.
Does anyone know if there is a library function somewhere for doing this, and if
not, what are the rules for this function.
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Question by:kaplan1
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5 Comments
 
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Expert Comment

by:ozo
ID: 1167140
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Expert Comment

by:kashif063098
ID: 1167141
hi!
I think you need to check for few things in the string

1- '@' sign
2- '.' after @ sign
3- look for .net,.gov,.com,.org

i think you already know this

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Expert Comment

by:dst
ID: 1167142
Here are some rules:

1. There must be no blank spaces.
2. There must be one (and only one) '@'-sign.
3. Only letters, numbers and following characters allowed:
   hyphen (-), dot (.) and underscore (_).
4. The part after the '@'-sign must contain at least one dot (.).

   I hope you will find it usefull.
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by:
saneesh100 earned 100 total points
ID: 1167143
Hello..

 You can do a lot of things.
First check for @ sysmbol and there should be only one but one is needed..

 ALso the second part contailns the name of the server for eg
xxx@hotmail.com menas he is a member of hotmail server.U can quesry to the nearest DNS server to find it's MX exchange servers name for eg mail.hotmail..com in the case of hotmail .THen u can connect to that server on port 25 and query if the user ( the part before @) is valid..

 It is the safest and reliablle method and will work correctly..

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LVL 84

Expert Comment

by:ozo
ID: 1167144
The proposed rules are incorrect.
More than one @ can appear in a valid email address,
as can blank spaces, or any other character when properly quoted.
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