Re: What are the valid characters in an email address?

Scott,

In the msf journals I have one field containing several data elements.  I 
have to strip out the email address which "generally" starts in the same 
place.  The problem is that an acceptance and a rejection may have the 
same email address, however one may have put the <...> around it.  I am 
trying to strip it down to the basics so that they look the same.  Then I 
am going to use SQL to find sends without either an acceptance or a 
rejection.  Bad enough I am using a UDF to strip out the email.  Using a 
UDF to validate domain names via your method may get even slower.

Sample data
DSPJRN JRN(QZMF) 
       RCVRNG(*CURCHAIN) 
       OUTPUT(*OUTFILE) 
       OUTFILE(QTEMP/ZMFSTUFF)
       ENTDTALEN(512) 
select joesd 
from qtemp/zmfstuff
ROBS1     ROB       113643QZMFSLOGEID 10324120401121524110000001142 *EH 
SNDMAIL TO MSF 
ROBS1     ROB       113643QZMFSLOGEID 10324120401121524110000001142 *E1 O 
POSTMASTER@xxxxxxxxxxxxxxxx 
ROBS1     ROB       113643QZMFSLOGEID 10324120401121524110000001142 *E2 R 
ROB@xxxxxxxxxxxxxxxx 
ROBS1     ROB       113643QZMFSLOGEID 10324120401121524110000001142 *EX 
/TMP/EMHDR774.TXT 
ROBS1     ROB       113643QZMFSLOGEID 10324120401121524110000001142  ET 
MSG SIZE 398 
ROBS1     ROB       113643QZMFACRT1ID 10324120401121524110000001142      
QMSF      QMSF      110492QZMFSLOGPID 10324120401121524110000001142 *P2 R 
SMTP MsgFwd ROB@xxxxxxxxxxxxxxxx
QMSF      QMSF      110492QZMFXLOGCID 10324120401121524110000001142 *C6 
FWD TO QTMSOUTQ 
QMSF      QMSF      110492QZMFXLOGCID 10324120401121524110000001142 *C1 O 
POSTMASTER@xxxxxxxxxxxxxxxx 
QMSF      QMSF      110492QZMFXLOGCID 10324120401121524110000001142 *C2 R 
<ROB@xxxxxxxxxxxxxxxx> 
QMSF      QMSF      110492QZMFBIGE2ID 10324120401121524110000001142 
000010000100000 
QTSMTPCLTPQTCP      113602QZMFXLOG8ID 10324120401121524110000001142 *8B 
QTMSOUTQ TO CLNT 
QTSMTPCLTPQTCP      113602QZMFXLOG8ID 10324120401121524110000001142 *88 
DLVED 10.10.1.141 
QTSMTPCLTPQTCP      113602QZMFXLOG8ID 10324120401121524110000001142 *82 R 
<ROB@xxxxxxxxxxxxxxxx> 


with 
T1 (Tranid, Subtype, joesd, emailaddress) as
(select substr(joesd,39,29), 
        substr(joesd,70, 2), 
        joesd, 
        stripemail(joesd) 
 from qtemp/ZMFSTUFF 
 where substr(joesd,70, 2) = 'P2' 
 ), 
T2 (Tranid, Subtype, emailaddress) as 
(select substr(joesd,39,29), 
        substr(joesd,70, 2), 
        stripemail(joesd) 
 from qtemp/ZMFSTUFF 
 where substr(joesd,70, 2) IN('82', '83') 
 ) 
select T1.Tranid, T1.Subtype, t1.joesd 
from T1 
exception join T2 
on T1.Tranid=T2.Tranid and t1.emailaddress=t2.emailaddress

Rob Berendt
-- 
"All creatures will make merry... under pain of death."
-Ming the Merciless (Flash Gordon)




Scott Klement <klemscot@xxxxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
01/12/2004 01:27 PM
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Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>


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Subject
Re: What are the valid characters in an email address?







As you've probably noticed, there are two parts to an e-mail address.  The
"user" part (actually, I think the RFCs refer to it as the "local part")
and the domain part.

For example:
   user@xxxxxxxxxxx

user = user part
example.com = domain part.

The rules for the user part of the address should be as relaxed as
possible.  The original standards in RFC 822 did limit the valid
characters, but newer documents state that ANY character should be allowed
in the local part aside from comma, space and the @ symbol.  And, even
those can be allowed if the local-part appears in quotes.

The domain part has to be a valid internet domain name.  Rather than try
to figure out the characters that are or are not allowed, I recommend just
doing a DNS lookup.

I wrote an article on validating e-mail addresses in the Nov 13, 2003
issue of the Club Tech Programming Tips Newsletter over on the iSeries
Network.  (A free associate membership will enable you to read it)

http://www.iseriesnetwork.com/resources/clubtech/index.cfm?fuseaction=ShowNewsletterIssue&ID=17632


If for some reason you can't sign-up for the iSeries Network, contact me
off-list and I'll send you the source code (but not the article) for the
e-mail validator.


On Mon, 12 Jan 2004 rob@xxxxxxxxx wrote:
>
> What characters are valid in an email address?
>
> - or -
>
> What characters are invalid in an email address?
>
> Rob Berendt
> --
> "All creatures will make merry... under pain of death."
> -Ming the Merciless (Flash Gordon)
> _______________________________________________
> This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing 
list
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