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Discover the allowed characters for an email address
This guide details the accepted and valid characters when you need to create an email address (up to 64 characters) within an Mail Service Infomaniak.
Preamble
- Some characters may be forbidden or allowed, but they are not the same characters depending on whether they are before or after the @ sign, as in nom-utilisateur.mail@nom-domaine.xyz for example.
- To understand the possibilities offered at the domain name level itself (distinct part "nom-domaine.xyz" that comes after the at sign @), refer to this other guide.
user-name.mail @ domain-name.xyz
In the part representing the user's email address (the distinct "nom-utilisateur.mail" part that comes before the at sign @) providers like Infomaniak may limit the use of certain characters when creating email addresses, even though they are allowed by the RFC (Request for Comments) #5321 and #5322, among others.
Here is what can be used or not in the part preceding the @ in an email address:
| forbidden characters | only allowed characters |
|---|---|
the dot (.) when used as the first or last character or consecutively ("anna.alpha" is allowed but "anna..alpha" is not allowed | |
the at sign (@) | the letters (from A to Z) |
the space ) | the numbers (from 0 to 9) |
the exclamation mark!) | the hyphen-) |
the hash sign#) | the underscore_) |
the dollar sign$) | |
the percent sign%) | |
the caret^) | |
the ampersand&) | |
the asterisk*) | |
the opening parenthesis (( ) | |
the closing parenthesis ( )) | |
the equal sign=) | |
the opening bracket ([) | |
the closing bracket]) | |
the opening bracket<) | |
the closing angle bracket>) | |
the comma,) | |
the quotation marks") | |
the slash/) | |
the semicolon;) | |
the question mark?) | |
| all non-ASCII characters | |
| all non-printable characters, such as those in the ASCII character set below 32 (e.g., control characters) | |
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