Does case matter in an email address? 1

[diogenes10]

An accounting package takes an email address in 100% lower case like
toadstool@frogpond.com

and changes it to 100% upper case in a report-like
TOADSTOOL@FROGPOND.COM

Would this cause users of the report generated by the accounting package to generate undeliverable email?

(I'm trying to decide if I see a problem that needs to be complained about.)

 

[Claudek]

Email addresses are not case-sensitive. You could even type in your email as JoEsMiTh@sOmEwHeRe.com and it will be delivered with no worries. There are many different reasons for undeliverable emails but case sensitivity is not one of them.





Claudius (What certifications??)

http://www.iteq.com.au

 

[zbnet]

Technically, SMTP addresses should be rendered in lower case. Unix (which is where the original implementations of SMTP servers began) is case sensitive, and so an upper case email address was really a different address from a lower case address.

That said, most modern implementations of SMTP can cope with mixed case email addresses, but you may still come across the old one that burps when given anything other than lower case. Stick with lower case and you'll never have an issue.