The number of different people who forwarded the email to other people.
The number of people who forward an email to other people is called a forward.
Literal Meanings of Unique Forwarders
Meanings of Unique:
A thing without something insurmountable or incomparable.
To be unique, unsurpassed, unbeatable or unbeatable.
A board owned by one owner.
Rare, unusual quality.
Sentences of Unique
Each person has a unique life, so each person has a unique journey. -Gary Koch.
Synonyms of Unique
sui generis, singular, one of a kind
Meanings of Forwarders:
Someone who forwards something or something to another destination.