Thanks for cooperation(s) :) On Thu, Apr 12, 2012 at 1:56 PM, Heinrich Breedt <heinrichbre...@gmail.com>wrote:
> You call that "good" ? :P > > > On Thu, Apr 12, 2012 at 5:06 PM, Les Hughes <l...@datarev.com.au> wrote: > >> Joseph Clark wrote: >> >>> I'm no expert on this either, but I'm fairly certain that this business >>> requirement is simply not achievable. Due to the way mail servers operate >>> on the Internet, there is no way for a sender to know if an intended >>> recipient address is valid. >>> >>> An email may go through several mail exchanges before it arrives at the >>> one that will ultimately deliver to the user's inbox. At any point along >>> the way, the email may be rejected for any variety of reasons and this >>> rejection may occur asynchronously. >>> >> Hi Muhammad, >> >> While I share a similar view about the requirements as the other posters, >> that what you are trying to do will not be possible as a 100% working case. >> >> BUT >> >> Here are a few things you can do: >> >> - Let's say your domain is taxionline.com: set the 'return-to' header >> variable to bou...@taxionline.com >> >> - Have some code which retrieves the bounce@ emails, looking for the >> emails which have 550 errors + the rest of them. Note that some returns >> will be "Out of Office" replies and so-forth. Here is some java code which >> helps sort emails by category: http://javaclue.blogspot.com.** >> au/2009/09/detect-bounced-**emails-part-2.html<http://javaclue.blogspot.com.au/2009/09/detect-bounced-emails-part-2.html> >> >> As others have noted, there are (at least) the following issues: >> - Your email might be rejected as spam by a server somewhere between you >> and the end mail server >> - When the email is dropped, you might not get any confirmation. >> - Any confirmation can take a long time to come back, making the whole >> exercise pointless. >> - Bounces might not be to standard, meaning you miss them. >> - Classifying an innocent email as a bounce would be disastrous for any >> legitimate user of your service. >> - While I don't know your business case, it seems automating this might >> be problematic in terms of how you deal with it, and something like an >> SMS/Phone confirmation (while also having inherent issues) might be >> something else to consider. >> >> Regardless, good luck :) >> -- >> Les Hughes >> l...@datarev.com.au >> >> P.S. For those interested, here is a good regular expression for email >> validation: >> >> (?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[**\] >> \000-\031]+(?:(?:(?:\r\n)?[ \t] >> )+|\Z|(?=[\["()<>@,;:\\".\[\]]**))|"(?:[^\"\r\\]|\\.|(?:(?:\r\**n)?[ >> \t]))*"(?:(?: >> \r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:( >> ?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|"(?:[^\"\r\\]|\\.|(?:(?:* >> *\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ >> \t])*(?:[^()<>@,;:\\".\[\] \000-\0 >> 31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\]\r\\]|\\.)*\ >> ](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+ >> (?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\]\r\\]|\\.)*\](?**: >> (?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z >> |(?=[\["()<>@,;:\\".\[\]]))|"(**?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ >> \t]))*"(?:(?:\r\n) >> ?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?:\ >> r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|\[([^\[\]\r\\]|\\.)*\](?** >> :(?:\r\n)?[ >> \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?:\r\n) >> ?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|\[([^\[\]\r\\]|\\.)*\](?**:(?:\r\n)?[ >> \t] >> )*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|\[([^\[\]\r\\]|\\.)*\](?**:(?:\r\n)?[ >> \t])* >> )(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?:\r\n)?[ \t] >> )+|\Z|(?=[\["()<>@,;:\\".\[\]]**))|\[([^\[\]\r\\]|\\.)*\](?:(?**:\r\n)?[ >> \t])*))*) >> *:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+ >> |\Z|(?=[\["()<>@,;:\\".\[\]]))**|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)**?[ >> \t]))*"(?:(?:\r >> \n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?: >> \r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|"(?:[^\"\r\\]|\\.|(?:(?:**\r\n)?[ >> \t >> ]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031 >> ]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\]\r\\]|\\.)*\]( >> ?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(? >> :(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\]\r\\]|\\.)*\](?**:(? >> :\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(? >> :(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|"(?:[^\"\r\\]|\\.|(?:(?:**\r\n)? >> [ \t]))*"(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ >> \t])*(?:(?:(?:[^()<>@,;:\\".\[**\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|"(?:[^\"\r\\]| >> \\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(?:[^()<> >> @,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|" >> (?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ >> \t])*))*@(?:(?:\r\n)?[ \t] >> )*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\ >> ".\[\]]))|\[([^\[\]\r\\]|\\.)***\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(? >> :[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[ >> \]]))|\[([^\[\]\r\\]|\\.)*\](?**:(?:\r\n)?[ >> \t])*))*|(?:[^()<>@,;:\\".\[\] \000- >> \031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|"(?:[^\"\r\\]|\\.|( >> ?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ >> \t])*(?:@(?:[^()<>@,; >> :\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([ >> ^\[\]\r\\]|\\.)*\](?:(?:\r\n)?**[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(?:[^()<>@,;:\\" >> .\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\ >> ]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ >> \t])*(?:[^()<>@,;:\\".\ >> [\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|\[([^\[\]\ >> r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\]]))|\[([^\[\]\r\\] >> |\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ >> \t])*)?(?:[^()<>@,;:\\".\[\] \0 >> 00-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|"(?:[^\"\r\\]|\\ >> .|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(?:[^()<>@, >> ;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[** >> \]]))|"(? >> :[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ >> \t])* >> (?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\". >> \[\]]))|\[([^\[\]\r\\]|\\.)*\]**(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ >> \t])*(?:[ >> ^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\] >> ]))|\[([^\[\]\r\\]|\\.)*\](?:(**?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ >> \t])*)(?:,\s*( >> ?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\ >> ".\[\]]))|"(?:[^\"\r\\]|\\.|(?**:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ >> \t])*)(?:\.(?:( >> ?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[ >> \["()<>@,;:\\".\[\]]))|"(?:[^\**"\r\\]|\\.|(?:(?:\r\n)?[ >> \t]))*"(?:(?:\r\n)?[ \t >> ])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] >> \000-\031]+(?:(?:(?:\r\n)?[ \t >> ])+|\Z|(?=[\["()<>@,;:\\".\[\]**]))|\[([^\[\]\r\\]|\\.)*\](?:(**?:\r\n)?[ >> \t])*)(? >> :\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+| >> \Z|(?=[\["()<>@,;:\\".\[\]]))|**\[([^\[\]\r\\]|\\.)*\](?:(?:\**r\n)?[ >> \t])*))*|(?: >> [^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\".\[**\ >> ]]))|"(?:[^\"\r\\]|\\.|(?:(?:\**r\n)?[ \t]))*"(?:(?:\r\n)?[ >> \t])*)*\<(?:(?:\r\n) >> ?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\[" >> ()<>@,;:\\".\[\]]))|\[([^\[\]\**r\\]|\\.)*\](?:(?:\r\n)?[ >> \t])*)(?:\.(?:(?:\r\n) >> ?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<> >> @,;:\\".\[\]]))|\[([^\[\]\r\\]**|\\.)*\](?:(?:\r\n)?[ >> \t])*))*(?:,@(?:(?:\r\n)?[ >> \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@, >> ;:\\".\[\]]))|\[([^\[\]\r\\]|\**\.)*\](?:(?:\r\n)?[ >> \t])*)(?:\.(?:(?:\r\n)?[ \t] >> )*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\ >> ".\[\]]))|\[([^\[\]\r\\]|\\.)***\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ >> \t])*)? >> (?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\["()<>@,;:\\". >> \[\]]))|"(?:[^\"\r\\]|\\.|(?:(**?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ >> \t])*)(?:\.(?:(?: >> \r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z|(?=[\[ >> "()<>@,;:\\".\[\]]))|"(?:[^\"\**r\\]|\\.|(?:(?:\r\n)?[ >> \t]))*"(?:(?:\r\n)?[ \t]) >> *))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t]) >> +|\Z|(?=[\["()<>@,;:\\".\[\]])**)|\[([^\[\]\r\\]|\\.)*\](?:(?:**\r\n)?[ >> \t])*)(?:\ >> .(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ >> \t])+|\Z >> |(?=[\["()<>@,;:\\".\[\]]))|\[**([^\[\]\r\\]|\\.)*\](?:(?:\r\**n)?[ >> \t])*))*\>(?:( >> ?:\r\n)?[ \t])*))*)?;\s*) >> >> >> Source: >> http://www.ex-parrot.com/~pdw/**Mail-RFC822-Address.html<http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html> >> >> Also interesting, a comparison of different regular expressions for >> email: >> http://www.pgregg.com/**projects/php/code/**showvalidemail.php<http://www.pgregg.com/projects/php/code/showvalidemail.php> >> >> > > > -- > Heinrich Breedt > > “Do not wait to strike till the iron is hot; but make it hot by striking.” > - William B. Sprague > -- Regards, Muhammad Niaz
