> Could use + in the first part of email such as: [email protected] to create throwaways. most sites consider those to be different email address then [email protected] for account purposes but email service, who respect the rfc, will threat them as the same.
There is no RFC that requires this behavior. Subaddressing within the local part is recognized as a common practice (e.g., in RFC 5233), but nothing requires a system to support subaddressing, or requires a system that does to support a particular separator character or character sequence (e.g., "+") for subaddressing. Email systems are free to implement or not implement subaddressing, and to use any character sequence they want as the separator.
There is no RFC that requires this behavior. Subaddressing within the local part is recognized as a common practice (e.g., in RFC 5233), but nothing requires a system to support subaddressing, or requires a system that does to support a particular separator character or character sequence (e.g., "+") for subaddressing. Email systems are free to implement or not implement subaddressing, and to use any character sequence they want as the separator.