Restrictions on adding subscribers

[choi]

I found out that subscribers cannot be registered in capital letters.
please let me know other restrictions on subscriber registration.
For example, special characters cannot be added, character limit, etc..

[John M]

Hi @choi ,

If you are referring to email subscribers, you can add them in all caps but the system will register the email address in lowercase (I was able to upload all caps email addresses both individually and in an import sheet). As for character limits, I was able to add a 230-character email address, so you should not have any issues with character limits for real email addresses. The only character restrictions would be the same ones that are applied to email addresses in general. 

Internet email addresses must include only RFC-compliant characters, which include:

• Numbers 0-9

• Uppercase letters A-Z

• Lowercase letters a-z

• Plus sign +

• Hyphen -

• Underscore _

• Tilde ~