Does a capital letter in an email address change it? Solved

Question

Hello,  For entering an internet address, does using uppercase or lowercase letters in a person's name have any impact?  If my address is quidam.personne@wanadoo.fr and someone types Quidam.Personne@xanadoo.fr, does it change anything?  For a company email, can the administrator who assigns addresses decide that the first letter of the first and last names must be uppercase, otherwise the address is considered invalid (in the paragraph above only the second address would be valid, if someone writes to the first one, will there be a failure return)?  Does this have to do with ASCII code?  Thank you for the responses and have a good end of the year.  Stephy

ipl · Accepted Answer

Hello Stephyfr, hello everyone,  Based on my experience, it doesn't matter whether you use uppercase or lowercase letters in an email address, but some sites check that the domain (after the @) respects the case. As a precaution, it is customary for email addresses to be written in lowercase.  quidam.personne@wanadoo.fr & Quidam.Personne@wanadoo.fr are equivalent (as are QUIDAM.PERSONNE@wanadoo.fr)!  @12C4 Ipl

jisisv · Answer

Email addresses are case insensitive (see the official RFC below), meaning that you can freely use uppercase or lowercase letters for their components.  However, the identifier (associated with the password) used to retrieve the mail may be case sensitive.  Source: http://www.faqs.org/rfcs/rfc821.html  Commands and replies are not case sensitive. That is, a command or reply word may be upper case, lower case, or any mixture of upper and lower case. Note that this is not true of mailbox user names. For some hosts the user name is case sensitive, and SMTP implementations must take case to preserve the case of user names as they appear in mailbox arguments. Host names are not case sensitive.  Johan Daine  The software said "Requires Windows98, Win2000, or better, So I installed Unix.

Stephyfr · Answer

So to make sure I've understood everything because my English is very basic: it is possible, after an implementation, that it may be necessary to use capital letters for an email address to be valid and work but that's not the rule and initially it didn't care whether the address was in uppercase or lowercase however, the names of the servers can be in uppercase or lowercase  Thank you for your answers and especially best wishes  Stephy

Does a capital letter in an email address change it?

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