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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for E-mailing option 6 letters:

RESEND: E-mailing option
DIGEST: E-mail listserve option
SEND: E-mail option
REPLYALL: E-mail option
BCCS: E-mail options
CCS: E-mail options, and this puzzle's theme
REPLY: E-mail option